Daxos the Returned

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."

The List

Legendary Cube Prize Pack

Commander 2015

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

Commander 2015 Oversized

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.

Experience

Spirit

This creature's power and toughness are each equal to the number of experience counters you have.