Flying
Each opponent who cast a spell this turn can't attack with creatures.
Each opponent who attacked with a creature this turn can't cast spells.

Flying
At the beginning of your end step, if creatures you control have total toughness 10 or greater, draw a card. Then if creatures you control have total toughness 20 or greater, untap each creature you control. Then if creatures you control have total toughness 40 or greater, each opponent loses half their life, rounded up.

Flying, haste
When Karrthus enters, gain control of all Dragons, then untap all Dragons.
Other Dragon creatures you control have haste.

Spells your opponents cast that target a Merfolk you control cost more to cast.
Abilities your opponents activate that target a Merfolk you control cost more to activate.

, Sacrifice an artifact or creature: Draw a card.

Affinity for artifacts (This spell costs less to cast for each artifact you control.)
When Emry enters, mill four cards.
: Choose target artifact card in your graveyard. You may cast that card this turn. (You still pay its costs. Timing rules still apply.)

Copy target instant or sorcery spell, then return it to its owner's hand. You may choose new targets for the copy.

, , Discard a card: Target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value until end of turn. (It retains its abilities.)

, : Search your library for a permanent card, put it onto the battlefield, then shuffle.

Mutate (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)
Flying
Whenever this creature mutates, create a red artifact token named Feather with ", Sacrifice this token: Return target Phoenix card from your graveyard to the battlefield tapped."

Whenever you tap a Forest for mana, add an additional .
+1: Put three +1/+1 counters on up to one target noncreature land you control. Untap it. It becomes a 0/0 Elemental creature with vigilance and haste that's still a land.
−8: You get an emblem with "Lands you control have indestructible." Search your library for any number of Forest cards, put them onto the battlefield tapped, then shuffle.

Colorless creatures you control get +2/+2.
Whenever you tap a permanent for , add an additional .
Whenever you cast a colorless spell, you gain 2 life.

Enchant land
Enchanted land has ": Prevent the next 1 damage that would be dealt to any target this turn."

Knight creatures you control have double strike.

Creatures can't attack you unless their controller pays for each creature they control that's attacking you.

Roll a six-sided die. If you roll a 1, Goblin Tutor has no effect. Otherwise, search your library for the indicated card, reveal it, put it into your hand, then shuffle.
2 — A card named Goblin Tutor
3 — An enchantment
4 — An artifact
5 — A creature
6 — An instant or sorcery

Hideaway 4 (When this land enters, look at the top four cards of your library, exile one face down, then put the rest on the bottom in a random order.)
: Add .
, : You may play the exiled card without paying its mana cost if you control four or more legendary creatures.

When this artifact enters, it deals 2 damage to any target.
, , Sacrifice another artifact: Create a 3/3 colorless Golem artifact creature token.

Trample
Tap an untapped artifact you control: This creature gets +1/+1 until end of turn.

Mutate (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)
Flash
Flying
Whenever this creature mutates, destroy target creature or planeswalker an opponent controls.