Blood Knight

Bramblewood Paragon

If Bramblewood Paragon enters at the same time as another Warrior (due to Living End, for example), that creature doesn't get a +1/+1 counter.

If a Warrior would normally enter with a certain number of +1/+1 counters on it, it enters with that many +1/+1 counters plus one on it instead. If a Warrior would normally enter with no +1/+1 counters on it, it enters with one +1/+1 counter on it instead.

The creature gets the counter if it would enter under your control. It doesn't matter who owns the creature or what zone it enters from (such as your opponent's graveyard, for example).

The effects from more than one Bramblewood Paragon are cumulative. That is, if you have more than one Bramblewood Paragon on the battlefield, Warrior creatures you control enter with that many additional +1/+1 counters on them.

Each other Warrior creature you control enters with an additional +1/+1 counter on it.
Each creature you control with a +1/+1 counter on it has trample.

Doran, the Siege Tower

Doran’s ability doesn’t actually change creatures’ power; it changes only the value of the combat damage they assign. All other rules and effects that check power or toughness use the real values.

Doran’s ability means, for example, that a 2/3 creature will assign 3 damage in combat instead of 2.

This effect is mandatory and affects all creatures.

Each creature assigns combat damage equal to its toughness rather than its power.

Electrolyze

If Electrolyze targets two creatures and one becomes an illegal target, the remaining target is dealt 1 damage, not 2. You'll still draw a card.

If all chosen targets are illegal as Electrolyze tries to resolve, it won't resolve and none of its effects will happen. No damage will be dealt and you won't draw a card.

You divide the damage as you cast Electrolyze, not as it resolves. Each target must be assigned at least 1 damage. In other words, as you cast Electrolyze, you choose whether to have it deal 2 damage to a single target, or deal 1 damage to each of two targets.

Electrolyze deals 2 damage divided as you choose among one or two targets.
Draw a card.

Groundbreaker

The creature is sacrificed at the end of every turn in which it is on the battlefield. There is no choice about what turn to sacrifice it.

Trample, haste
At the beginning of the end step, sacrifice Groundbreaker.

Imperious Perfect

Because damage remains marked on a creature until the damage is removed as the turn ends, nonlethal damage dealt to Elves you control may become lethal if Imperious Perfect leaves the battlefield during that turn.

Other Elves you control get +1/+1.
{G}, {T}: Create a 1/1 green Elf Warrior creature token.

Mutavault

Although Mutavault has all creature types while it's animated, it does not have the changeling keyword ability.

A noncreature permanent that turns into a creature can attack, and its {T} abilities can be activated, only if its controller has continuously controlled that permanent since the beginning of their most recent turn. It doesn't matter how long the permanent has been a creature.

{T}: Add {C}.
{1}: Mutavault becomes a 2/2 creature with all creature types until end of turn. It's still a land.

Niv-Mizzet, the Firemind

If a spell or ability causes you to draw multiple cards, Niv-Mizzet's ability triggers that many times.

If dealing 1 damage to a permanent or player causes you to draw a card, perhaps because Niv-Mizzet is enchanted by Curiosity, you'll continue this loop until the loop is interrupted, perhaps by a player losing the game.

Flying
Whenever you draw a card, Niv-Mizzet, the Firemind deals 1 damage to any target.
{T}: Draw a card.

Rakdos Guildmage

If the second ability is activated during the end step, the token won't be exiled until the following turn's end step.

({B/R} can be paid with either {B} or {R}.)
{3}{B}, Discard a card: Target creature gets -2/-2 until end of turn.
{3}{R}: Create a 2/1 red Goblin creature token with haste. Exile it at the beginning of the next end step.

Serra Avenger

You can cast Serra Avenger during another player's first, second, or third turns of the game if some other effect (such as Vedalken Orrery) enables that.

If the game is restarted (by Karn Liberated), you can't cast Serra Avenger in your first, second, or third turn in the new game.

Serra Avenger cares about how many turns you have taken, not necessarily how many turns the game has had, in case you take an extra turn.

You can't cast this spell during your first, second, or third turns of the game.
Flying, vigilance

Urza's Factory

Urza's is a land subtype that has no inherent rules meaning. Other effects may refer to it.

{T}: Add {C}.
{7}, {T}: Create a 2/2 colorless Assembly-Worker artifact creature token.

Voidslime

Abilities that create replacement effects, such as a permanent entering the battlefield tapped or with counters on it, can't be targeted. Abilities that apply "as [this creature] enters the battlefield" are also replacement effects and can't be targeted.

Activated abilities are written in the form "[Cost]: [Effect]." Some keyword abilities, such as equip, are activated abilities and will have colons in their reminder texts. Loyalty abilities of planeswalkers are activated abilities.

An activated mana ability is one that adds mana as it resolves, doesn't have a target, and isn't a loyalty ability. A triggered mana ability is one that adds mana and triggers on an activated mana ability.

If you counter a delayed triggered ability that triggered at the beginning of the "next" occurrence of a specified step or phase, that ability won't trigger again the following time that phase or step occurs.

Triggered abilities use the word "when," "whenever," or "at." They're often written as "[Trigger condition], [effect]." Some keyword abilities, such as afterlife, are triggered abilities and will have "when," "whenever," or "at" in their reminder text.

Counter target spell, activated ability, or triggered ability. (Mana abilities can't be targeted.)

Card (12)	Type	^{$744.65 (881.65)} Price
Blood Knight - inverted - 2003	Creature	$4.00 ^(4.00)
Bramblewood Paragon - 2003	Creature	$11.00 ^(11.00)
Doran, the Siege Tower - 2003	Creature	$130.00 ^(80.00)
Electrolyze - 2003	Instant	$2.00 ^(2.00)
Groundbreaker - 2003	Creature	$50.00 ^(35.00)
Imperious Perfect - 2003	Creature	$7.50 ^(7.50)
Mutavault - 2003	Land	$400.00 ^(600.00)
Niv-Mizzet, the Firemind - 2003	Creature	$55.00 ^(55.00)
Rakdos Guildmage - 2003	Creature	$0.15 ^(0.15)
Serra Avenger - 2003	Creature	$50.00 ^(50.00)
Urza's Factory - 2003	Land	$5.00 ^(5.00)
Voidslime - 2003	Instant	$30.00 ^(32.00)

Champs and States