Daxos the Returned

All experience counters are identical, no matter how you got them. For example, the last ability will count experience counters that you got from the first ability, from another ability, from proliferating, and so on.

Each game pack includes a card labeled “Experience” with the suggestion “Place your experience counters here.” This card isn’t required for play. It’s simply a convenient spot to put your experience counters, which can be represented with dice, glass beads, or other small items.

Experience counters are the second kind of counters a player can have, joining poison.

Putting an enchantment creature token onto the battlefield won’t cause Daxos’s first ability to trigger. On the other hand, constellation abilities trigger whenever an enchantment enters the battlefield under your control, so those abilities will trigger.

The ability that defines the token’s power and toughness is part of the token’s copiable values. Copies of the token will also have that ability.

The power and toughness of the tokens will change as the number of experience counters you have does.

Whenever you cast an enchantment spell, you get an experience counter.
{1}{W}{B}: Create a white and black Spirit enchantment creature token. It has "This creature's power and toughness are each equal to the number of experience counters you have."

Ezuri, Claw of Progress

Each game pack includes a card labeled “Experience” with the suggestion “Place your experience counters here.” This card isn't required for play. It's simply a convenient spot to put your experience counters, which can be represented with dice, glass beads, or other small items.

Whenever a creature you control with power 2 or less enters, you get an experience counter.
At the beginning of combat on your turn, put X +1/+1 counters on another target creature you control, where X is the number of experience counters you have.

Kalemne, Disciple of Iroas

Double strike, vigilance
Whenever you cast a creature spell with mana value 5 or greater, you get an experience counter.
Kalemne, Disciple of Iroas gets +1/+1 for each experience counter you have.

Meren of Clan Nel Toth

If Meren of Clan Nel Toth leaves the battlefield at the same time as other creatures you control die, its first ability will trigger for each of those creatures.

If a creature card in your graveyard has {X} in its mana cost, X is 0.

You can’t choose to put the creature card into your hand if its mana value is less than or equal to the number of experience counters you have as the ability resolves.

Whenever another creature you control dies, you get an experience counter.
At the beginning of your end step, choose target creature card in your graveyard. If that card's mana value is less than or equal to the number of experience counters you have, return it to the battlefield. Otherwise, put it into your hand.

Mizzix of the Izmagnus

Each game pack includes a card labeled "Experience" with the suggestion "Place your experience counters here." This card isn't required for play. It's simply a convenient spot to put your experience counters, which can be represented with dice, glass beads, or other small items.

If an instant or sorcery spell you cast has {X} in its mana cost, you choose the value of X before calculating the spell's total cost. For example, if that spell's mana cost is {X}{R} and you have one experience counter, you could choose 5 as the value of X and pay {4}{R} to cast the spell.

If there are additional costs to cast a spell, or if the cost to cast a spell is increased by an effect (such as the one created by Thalia, Guardian of Thraben's ability), apply those increases before applying cost reductions.

Mizzix's last ability can't reduce the amount of colored mana you pay for a spell. It reduces only the generic component of that cost.

Mizzix's last ability doesn't change the mana cost or mana value of any spell. It changes only the total cost you pay.

The cost reduction can apply to alternative costs such as flashback costs.

You finish casting a spell, including paying its costs, before Mizzix's first ability triggers. The ability that gives you the experience counter will resolve before the spell that caused it to trigger.

Whenever you cast an instant or sorcery spell with mana value greater than the number of experience counters you have, you get an experience counter.
Instant and sorcery spells you cast cost {1} less to cast for each experience counter you have.

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Card (5)	Type	^{$0.00 (0.00)} Price
Daxos the Returned	Creature	$0.00 ^(0.00)
Ezuri, Claw of Progress	Creature	$0.00 ^(0.00)
Kalemne, Disciple of Iroas	Creature	$0.00 ^(0.00)
Meren of Clan Nel Toth	Creature	$0.00 ^(0.00)
Mizzix of the Izmagnus	Creature	$0.00 ^(0.00)