Sky Swallower

Flying
When Sky Swallower enters, target opponent gains control of all other permanents you control.

Dust Elemental

Flash (You may cast this spell any time you could cast an instant.)
Flying; fear (This creature can't be blocked except by artifact creatures and/or black creatures.)
When Dust Elemental enters, return three creatures you control to their owner's hand.

Leveler

When Leveler enters, exile all cards from your library.

Torpor Orb

Creatures entering don't cause abilities to trigger.

Eater of Days

Flying, trample
When Eater of Days enters, you skip your next two turns.

Wormfang Manta

Flying
When Wormfang Manta enters, you skip your next turn.
When Wormfang Manta leaves the battlefield, you take an extra turn after this one.

Hushwing Gryff

Flash
Flying
Creatures entering don't cause abilities to trigger.

Clackbridge Troll

Trample, haste
When Clackbridge Troll enters, target opponent creates three 0/1 white Goat creature tokens.
At the beginning of combat on your turn, any opponent may sacrifice a creature of their choice. If a player does, tap Clackbridge Troll, you gain 3 life, and you draw a card.