Flying
Whenever this creature attacks, other attacking creatures you control with flying get +2/+2 until end of turn.

Flying (This creature can't be blocked except by creatures with flying or reach.)
Whenever a creature dealt damage by this creature this turn dies, put a +1/+1 counter on this creature.

Flying
Whenever this creature deals combat damage to a player, you may cast a spell from your hand without paying its mana cost.

Flying
Whenever a source deals damage to this creature, that source's controller mills that many cards.

Exile target creature or enchantment.

Whenever a creature dies, this creature gets +2/+2 until end of turn.

Landfall — Whenever a land you control enters, create a 1/1 green Saproling creature token.

Deathtouch
At the beginning of your end step, if you gained life this turn, each opponent sacrifices a creature of their choice and you return up to one target creature card from your graveyard to your hand.

Flying
Whenever you cast an instant or sorcery spell, scry 1. (Look at the top card of your library. You may put that card on the bottom.)

When this creature enters, create two Treasure tokens. (They're artifacts with ", Sacrifice this token: Add one mana of any color.")

, Sacrifice another creature: Put a +1/+1 counter on this creature and you gain 2 life.

When this creature enters, you may have it fight target creature you don't control.

Flying
Other creatures you control with flying get +1/+0.

Target creature gets +7/+7 and gains trample until end of turn. It must be blocked this turn if able. (A creature with trample can deal excess combat damage to the player or planeswalker it's attacking.)

Flying
Vigilance (Attacking doesn't cause this creature to tap.)

Whenever another nontoken creature dies, you may create a 1/1 black Rat creature token.
Rats you control have deathtouch.

Whenever you gain life, this creature gains flying until end of turn.

Whenever a creature you control enters, put a +1/+1 counter on each creature you control.

Prevent all noncombat damage that would be dealt to you and creatures you control.
Whenever a nontoken creature you control enters, create a 2/2 white Unicorn creature token.

When this creature enters, creatures without flying can't block this turn.

When this creature enters, put a +1/+1 counter on each other creature you control.

When this creature enters, you draw two cards and you lose 2 life.

When Muxus enters, reveal the top six cards of your library. Put all Goblin creature cards with mana value 5 or less from among them onto the battlefield and the rest on the bottom of your library in a random order.
Whenever Muxus attacks, it gets +1/+1 until end of turn for each other Goblin you control.

Vigilance (Attacking doesn't cause this creature to tap.)

Flying
When this creature enters, create a 1/1 white Human creature token.

At the beginning of your upkeep, return an instant or sorcery card at random from your graveyard to your hand.
Whenever you cast an instant or sorcery spell, this creature gets +4/+0 until end of turn.

Whenever you cast a creature spell, you may draw a card.

Flying
Whenever an artifact creature you control deals combat damage to a player, you may create a 1/1 blue Thopter artifact creature token with flying.

When this creature enters, you gain 5 life.

When this creature enters, you may have it fight target creature you don't control. (Each deals damage equal to its power to the other.)

Reach
Ulvenwald Hydra's power and toughness are each equal to the number of lands you control.
When this creature enters, you may search your library for a land card, put it onto the battlefield tapped, then shuffle.

Enchant creature
Enchanted creature gets +3/+3.
Whenever enchanted creature deals combat damage to a player, double its controller's life total.

This creature enters with X +1/+1 counters on it, where X is the total toughness of other creatures you control.
Sacrifice a creature with defender: All creatures gain trample until end of turn.

Immolating Gyre deals X damage to each creature and planeswalker you don't control, where X is the number of instant and sorcery cards in your graveyard.

Whenever you cast a creature spell, create a 3/3 green Beast creature token.
Whenever you cast a noncreature spell, put three +1/+1 counters on target creature you control.
Landfall — Whenever a land you control enters, you gain 3 life.