Nontoken creatures you control have riot. (They enter with your choice of a +1/+1 counter or haste.) If a creature you control with a +1/+1 counter on it would deal damage to a permanent or player, it deals double that damage instead.

Creatures you control are every creature type. The same is true for creature spells you control and creature cards you own that aren't on the battlefield. {3}, {T}: Create a 2/2 blue Shapeshifter creature token with changeling. (It is every creature type.)

Draw two cards, then discard two cards. Flashback {2}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Search your library for up to three creature cards, put them into your graveyard, then shuffle.

Changeling (This card is every creature type.) This creature can't block and can't be blocked.

Whenever one or more artifact and/or creature cards leave your graveyard, you gain 1 life. When this enchantment enters, mill four cards. You may put an artifact, creature, or land card from among the milled cards into your hand. (To mill four cards, put the top four cards of your library into your graveyard.)

Changeling (This card is every creature type.) When this creature enters, you may return target creature card from your graveyard to your hand.