Creatures you control with flying get +1/+1.

When Mjölnir enters, attach it to target legendary creature you control.
Whenever equipped creature attacks, tap target creature defending player controls and put a stun counter on it. Then Mjölnir deals damage to each opponent equal to the number of tapped creatures that opponent controls.
Equip

, Pay 1 life: Add or .
, , Sacrifice this land: Draw a card.

Enchant creature
Enchanted creature gets +2/+1 and has protection from white.
Madness (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

This creature enters with X +1/+1 counters on it.
: Put a +1/+1 counter on this creature.
When this creature dies, draw a card for each +1/+1 counter on it.

Return up to six target creature cards with different names from your graveyard to the battlefield.

, : Return target permanent you both own and control to your hand.

When Kroxa enters, sacrifice it unless it escaped.
Whenever Kroxa enters or attacks, each opponent discards a card, then each opponent who didn't discard a nonland card this way loses 3 life.
Escape—, Exile five other cards from your graveyard. (You may cast this card from your graveyard for its escape cost.)

Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)
When this creature is turned face up, change the target of target spell or ability with a single target.

Counter target spell. Clash with an opponent. If you win, at the beginning of your next main phase, you may add an amount of equal to that spell's mana value. (Each clashing player reveals the top card of their library, then puts that card on their choice of the top or bottom. A player wins if their card had a greater mana value.)

Instant and sorcery spells you cast cost less to cast.
Whenever a spell or ability you control counters a spell, you may draw a card. If you do, discard a card.

First strike
As Squall enters, choose a number.
Whenever one or more creatures attack one of your opponents, if any of those creatures have power or toughness equal to the chosen number, Squall deals damage equal to its power to defending player.

Strive — This spell costs more to cast for each target beyond the first.
Choose any number of target creatures. Double the number of +1/+1 counters on each of them.

Destroy all creatures. They can't be regenerated.

This creature gets +1/+1 for each land card in your graveyard.
, Sacrifice a Forest or Plains: Search your library for a land card, put it onto the battlefield, then shuffle.

Search your library for up to three creature cards, reveal them, then shuffle and put those cards on top in any order.

Affinity for artifacts (This spell costs less to cast for each artifact you control.)
When Emry enters, mill four cards.
: Choose target artifact card in your graveyard. You may cast that card this turn. (You still pay its costs. Timing rules still apply.)

Flying
When Yosei dies, target player skips their next untap step. Tap up to five target permanents that player controls.

Each opponent sacrifices a creature or planeswalker with the greatest mana value among creatures and planeswalkers they control.

Sacrifice this enchantment: Return to your hand all creature cards in your graveyard that were put there from the battlefield this turn.