Hexproof from artifacts, creatures, and enchantments
When Nevinyrral, Urborg Tyrant enters the battlefield, create a tapped 2/2 black Zombie creature token for each creature that died this turn.
When Nevinyrral dies, you may pay . When you do, destroy all artifacts, creatures, and enchantments.

Landfall — Whenever a land enters the battlefield under your control, put a loyalty counter on Nissa of Shadowed Boughs.
[+1]: Untap target land you control. You may have it become a 3/3 Elemental creature with haste and menace until end of turn. It's still a land.
[−5]: You may put a creature card with converted mana cost less than or equal to the number of lands you control onto the battlefield from your hand or graveyard with two +1/+1 counters on it.

Defender (This creature can't attack.)
As long as Novice Knight is enchanted or equipped, it can attack as though it didn't have defender.

Kicker
Menace, lifelink
When Nullpriest of Oblivion enters the battlefield, if it was kicked, return target creature card from your graveyard to the battlefield.

Whenever an opponent draws a card, Ob Nixilis, the Hate-Twisted deals 1 damage to that player.
[−2]: Destroy target creature. Its controller draws two cards.

Partner with Zndrsplt, Eye of Wisdom (When this creature enters the battlefield, target player may put Zndrsplt into their hand from their library, then shuffle.)
At the beginning of combat on your turn, flip a coin until you lose a flip.
Whenever a player wins a coin flip, double Okaun's power and toughness until end of turn.

[+2]: Create a Food token. (It's an artifact with ", , Sacrifice this artifact: You gain 3 life.")
[+1]: Target artifact or creature loses all abilities and becomes a green Elk creature with base power and toughness 3/3.
[−5]: Exchange control of target artifact or creature you control and target creature an opponent controls with power 3 or less.

When Old-Growth Dryads enters the battlefield, each opponent may search their library for a basic land card, put it onto the battlefield tapped, then shuffle their library.

, Sacrifice another creature: Pitiless Pontiff gains deathtouch and indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)

Flash
When Portal Mage enters the battlefield during the declare attackers step, you may reselect which player or planeswalker target attacking creature is attacking. (It can't attack its controller or its controller's planeswalkers.)

Choose one —
• Counter target spell if it's blue.
• Destroy target permanent if it's blue.

Refuse deals damage to target spell's controller equal to that spell's converted mana cost.

Rielle, the Everwise gets +1/+0 for each instant and sorcery card in your graveyard.
Whenever you discard one or more cards for the first time each turn, draw that many cards.

When Rumbling Sentry enters the battlefield, scry 1.

[+2]: Sarkhan, Dragonsoul deals 1 damage to each opponent and each creature your opponents control.
[−3]: Sarkhan, Dragonsoul deals 4 damage to target player or planeswalker.
[−9]: Search your library for any number of Dragon creature cards, put them onto the battlefield, then shuffle your library.

Exile target creature. Put two loyalty counters on a planeswalker you control.

Flying
Whenever you cycle or discard a card, Shadowstorm Vizier gets +1/+1 until end of turn.

Shaper Apprentice has flying as long as you control another Merfolk.

(Theme color: )

[+1]: Draw a card. At the beginning of the next end step, untap up to two lands.
[−3]: Put target nonland permanent into its owner's library third from the top.
[−8]: You get an emblem with "Whenever you draw a card, exile target permanent an opponent controls."