Counter target spell. If that spell is countered this way, put it on top of its owner's library instead of into that player's graveyard.

Flying, lifelink
Whenever another nontoken creature you control dies, return that card to its owner's hand at the beginning of the next end step.
If a creature an opponent controls would die, exile it instead.

Whenever one or more creatures you control deal combat damage to a player, you may sacrifice one of them. If you do, reveal cards from the top of your library until you reveal a creature card that shares a creature type with the sacrificed creature. Put that card onto the battlefield and the rest on the bottom of your library in a random order.

Whenever a creature or enchantment you control enters this turn, draw a card.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

+2: Up to one target legendary creature gains vigilance, lifelink, and indestructible until your next turn.
−3: Reveal the top four cards of your library. Put any number of legendary cards from among them into your hand and the rest into your graveyard. Create a Treasure token for each card put into your graveyard this way.
−11: Gain control of all nonland permanents until end of turn. Untap them. They gain haste until end of turn.
Dihada, Binder of Wills can be your commander.

Landfall — Whenever a land you control enters, create a 2/2 green Elemental creature token.

Vigilance, menace, lifelink
Whenever Kroxa and Kunoros enters or attacks, you may exile five cards from your graveyard. When you do, return target creature card from your graveyard to the battlefield.

Whenever you draw your second card each turn, this creature deals 3 damage to any target.

As an additional cost to cast this spell, behold an Elemental and exile it. (Exile an Elemental you control or an Elemental card from your hand.)
Whenever another Elemental you control enters, it deals damage equal to its power to each opponent.
When this creature leaves the battlefield, return the exiled card to its owner's hand.

At the beginning of your upkeep, this creature deals 3 damage to target creature you control.

This land enters tapped.
When this land enters, exile target player's graveyard.
: Add .

Double strike, vigilance
Spells you cast have affinity for artifacts. (They cost less to cast for each artifact you control.)

Creatures entering don't cause abilities to trigger.

Exile all cards from target player's graveyard other than basic land cards. For each card exiled this way, search that player's library for all cards with the same name as that card and exile them. Then that player shuffles.

When this Equipment enters, it deals 2 damage to any target and 1 damage to you.
Equipped creature gets +1/+0 and has menace. (It can't be blocked except by two or more creatures.)
Equip (: Attach to target creature you control. Equip only as a sorcery.)

Choose one —
• Draw cards equal to the greatest power among non-Human creatures you control.
• Non-Human creatures you control get +3/+3 until end of turn.

When this creature enters, untap target Goat and gain control of it until end of turn. It gains haste until end of turn.

Exile target creature. Its controller may search their library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Reach
Whenever another nontoken creature you control dies, you may reveal cards from the top of your library until you reveal a creature card. Put that card into your hand and the rest on the bottom of your library in a random order.

+1: Create a tapped Powerstone token. (It's an artifact with ": Add . This mana can't be spent to cast a nonartifact spell.")
−1: Pay any amount of mana. Look at that many cards from the top of your library, then put one of those cards into your hand and the rest on the bottom of your library in a random order.
−7: You get an emblem with "Tap an untapped artifact you control: This emblem deals 1 damage to any target."