Boldwyr Heavyweights

Trample
When Boldwyr Heavyweights enters, each opponent may search their library for a creature card and put it onto the battlefield. Then each player who searched their library this way shuffles.

Eater of Days

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

Hushwing Gryff

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

Denizen of the Deep

When Denizen of the Deep enters, return each other creature you control to its owner's hand.

Sky Swallower

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

Hushbringer

Flying, lifelink
Creatures entering or dying don't cause abilities to trigger.

Voidslime

Counter target spell, activated ability, or triggered ability. (Mana abilities can't be targeted.)

Trickbind

Split second (As long as this spell is on the stack, players can't cast spells or activate abilities that aren't mana abilities.)
Counter target activated or triggered ability. If a permanent's ability is countered this way, activated abilities of that permanent can't be activated this turn. (Mana abilities can't be targeted.)

Stifle

Counter target activated or triggered ability. (Mana abilities can't be targeted.)

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.

Leveler

When Leveler enters, exile all cards from your library.

Doorkeeper Thrull

Flash
Flying
Artifacts and creatures entering don't cause abilities to trigger.

Tocatli Honor Guard

Creatures entering don't cause abilities to trigger.

Phyrexian Dreadnought

Trample
When Phyrexian Dreadnought enters, sacrifice it unless you sacrifice any number of creatures with total power 12 or greater.

Mistmeadow Witch

{2}{W}{U}: Exile target creature. Return that card to the battlefield under its owner's control at the beginning of the next end step.