Chalice of the Void

A mana cost of {X}{X} means that you pay twice X. For example, if you want X to be 3, you pay {6} to cast Chalice of the Void.

Chalice of the Void has to be on the battlefield at the end of casting a spell for the ability to trigger. If you sacrifice Chalice of the Void as a cost to cast a spell, its ability can't trigger. However, if it leaves the battlefield once its ability has triggered, that ability will still counter the spell.

If there are zero charge counters on Chalice of the Void, it counters each spell with a mana value of 0. This includes face-down creature spells cast with morph's alternative cost.

The number of charge counters on Chalice of the Void matters only at the time the spell is cast. Changing the number of charge counters on Chalice of the Void after a spell has been cast won't change whether the ability triggers or counters the spell.

Chalice of the Void enters the battlefield with X charge counters on it.
Whenever a player casts a spell with mana value equal to the number of charge counters on Chalice of the Void, counter that spell.

Isolated Watchtower

You can activate Isolated Watchtower’s ability if you control more lands than an opponent, as long as at least one opponent also controls two or more lands than you.

{T}: Add {C}.
{2}, {T}: Scry 1, then you may reveal the top card of your library. If a basic land card is revealed this way, put it onto the battlefield tapped. Activate only if an opponent controls at least two more lands than you.

Hanna was astounded. Mirri read every leaf and wisp of breeze like a book of ancient lore.

Mirri's Guile

At the beginning of your upkeep, you may look at the top three cards of your library, then put them back in any order.

"The past does not determine our present."

Monastery Mentor

Any spell you cast that doesn't have the type creature will cause prowess to trigger. If a spell has multiple types, and one of those types is creature (such as an artifact creature), casting it won't cause prowess to trigger. Playing a land also won't cause prowess to trigger.

Casting a noncreature spell will cause both prowess and Monastery Mentor's other ability to trigger. You can put these abilities on the stack in either order. Whichever ability is put on the stack last will resolve first.

Once it triggers, prowess isn't connected to the spell that caused it to trigger. If that spell is countered, prowess will still resolve.

Prowess goes on the stack on top of the spell that caused it to trigger. It will resolve before that spell.

Prowess triggers only once for any spell, even if that spell has multiple types.

The spell that causes Monastery Mentor's second ability to trigger will not cause the prowess ability of the Monk token that's created to trigger.

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
Whenever you cast a noncreature spell, create a 1/1 white Monk creature token with prowess.

The suns of Mirrodin have shone upon perfection only once.

Mox Opal

If you control Mox Opal and one other artifact, then have a second Mox Opal enter the battlefield as your third artifact, you can't activate either one's mana ability before putting one into your graveyard due to the “legend rule.”

Metalcraft — {T}: Add one mana of any color. Activate only if you control three or more artifacts.

Does it reflect the future that once was or the past that can never be?

Reflecting Pool

Any change to a land's type or splicing of text into a land can affect the types of mana a land can produce.

Any replacement effects are considered by Reflecting Pool when determining the types of mana a land can produce.

Multiple Reflecting Pools won't help each other produce mana. If you control a Reflecting Pool, and all other lands you control either lack mana abilities or are other Reflecting Pools, you may still activate Reflecting Pool's ability — it just won't produce any mana.

Reflecting Pool checks the effects of all mana-producing abilities of lands you control, but it doesn't check their costs. For example, Vivid Crag says "{T}, Remove a charge counter from Vivid Crag: Add one mana of any color." If you control Vivid Crag and Reflecting Pool, you can tap Reflecting Pool for any color of mana. It doesn't matter whether Vivid Crag has a charge counter on it, and it doesn't matter whether it's untapped.

Reflecting Pool doesn't care about any restrictions or riders your lands put on the mana they produce, such as Pillar of the Paruns and Hall of the Bandit Lord do. It just cares about types of mana.

The types of mana are white, blue, black, red, green, and colorless.

{T}: Add one mana of any type that a land you control could produce.

Hidden within the clicking, chittering swarm is a unique mind, still young, but growing more aware as time passes.

Sliver Legion

Abilities that Slivers grant, as well as power/toughness boosts, are cumulative. However, for some abilities, like flying, having more than one instance of the ability doesn't provide any additional benefit.

If the creature type of a Sliver changes so it's no longer a Sliver, it will no longer be affected by its own ability. Its ability will continue to affect other Sliver creatures.

Because damage remains marked on a creature until the damage is removed as the turn ends, nonlethal damage dealt to a Sliver may become lethal if another Sliver leaves the battlefield during that turn.

If Sliver Legion and two other Slivers are on the battlefield, for example, each of them gets +2/+2.

All Sliver creatures get +1/+1 for each other Sliver on the battlefield.

Yuriko, the Tiger's Shadow

Activating Yuriko's commander ninjutsu ability isn't the same as casting Yuriko as a spell. You won't have to pay the commander tax to activate that ability, and activating that ability won't increase the commander tax to pay later.

Although the ninjutsu ability has the creature enter the battlefield attacking, it was never declared as an attacking creature (for the purposes of abilities that trigger whenever a creature attacks, for example).

Commander ninjutsu is a variant of ninjutsu that can be activated from the command zone as well as from your hand. Just as with regular ninjutsu, the Ninja enters attacking the player or planeswalker that the returned creature was attacking.

If a card in a player's library has {X} in its mana cost, X is considered to be 0.

Commander ninjutsu {U}{B} ({U}{B}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand or the command zone tapped and attacking.)
Whenever a Ninja you control deals combat damage to a player, reveal the top card of your library and put that card into your hand. Each opponent loses life equal to that card's mana value.

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Card (8)	Type	^{$0.00 (0.00)} Price
Chalice of the Void	Artifact	$0.00 ^(0.00)
Isolated Watchtower	Land	$0.00 ^(0.00)
Mirri's Guile	Enchantment	$0.00 ^(0.00)
Monastery Mentor	Creature	$0.00 ^(0.00)
Mox Opal	Artifact	$0.00 ^(0.00)
Reflecting Pool	Land	$0.00 ^(0.00)
Sliver Legion	Creature	$0.00 ^(0.00)
Yuriko, the Tiger's Shadow	Creature	$0.00 ^(0.00)