'Egg' cards

Defender When this creature enters, scry 2. When you sacrifice this creature, return it to the battlefield transformed under its owner's control at the beginning of the next end step.

At the beginning of your upkeep, roll a six-sided die. If you roll a 6, sacrifice this creature and create a 4/4 red Giant Bird creature token.

Evolve (Whenever a creature you control enters, if that creature has greater power or toughness than this creature, put a +1/+1 counter on this creature.) When this creature dies, you may discover X, where X is its toughness.

Whenever this creature or a Dragon you control dies, you may cast a creature spell from among cards you own in exile with hatching counters on them without paying its mana cost.

Defender

Defender {1}{U}: Put a hatchling counter on this creature. Then if there are five or more hatchling counters on it, remove all of them and transform it.

Whenever this creature mutates, put a +1/+1 counter on it.

Defender (This creature can't attack.) When this creature dies, create a 3/3 white Bird creature token with flying.

When this creature dies, create a 4/4 red Bird creature token with flying at the beginning of the next end step.

Defender Whenever you cast an instant or sorcery spell, put a number of ember counters on this creature equal to the amount of mana spent to cast that spell. Then if this creature has seven or more ember counters on it, remove them and transform this creature.

Imprint - When this creature enters, you may exile a card from your hand face down. When this creature dies, turn the exiled card face up. If it's a creature card, put it onto the battlefield under your control.