Flying
When Merfolk Skydiver enters the battlefield, put a +1/+1 counter on target creature you control.
: Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

(Theme color: )

, , Sacrifice Oashra Cultivator: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle your library.

Draw X cards, then discard a card.

Spectacle (You may cast this spell for its spectacle cost rather than its mana cost if an opponent lost life this turn.)
When Rix Maadi Reveler enters the battlefield, discard a card, then draw a card. If Rix Maadi Reveler's spectacle cost was paid, instead discard your hand, then draw three cards.

First strike
As long as you control a Rowan planeswalker, Rowan's Battleguard gets +3/+0.

Put target artifact or creature on top of its owner's library.

Whenever you cycle or discard a card, you may pay . If you do, put a -1/-1 counter on target creature.

When Sanguine Glorifier enters the battlefield, put a +1/+1 counter on another target Vampire you control.

, , Discard a card: Target player mills three cards.

Create two 1/1 colorless Servo artifact creature tokens.

Flying, vigilance
Spells your opponents cast that target Sphinx of New Prahv cost more to cast.

, Exert Steward of Solidarity: Create a 1/1 white Warrior creature token with vigilance. (An exerted creature won't untap during your next untap step.)

When Sumala Woodshaper enters the battlefield, look at the top four cards of your library. You may reveal a creature or enchantment card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.

Sacrifice three white creatures: Exile target creature.
Whenever another black creature you control dies, create a 1/1 white Spirit creature token with flying.

Counter target spell. Its controller mills three cards.

Creatures entering the battlefield don't cause abilities to trigger.

Whenever Undead Augur or another Zombie you control dies, you draw a card and you lose 1 life.