Sorcery — Adventure

You gain X life and each opponent loses X life, where X is the number of Knights you control.

Curry Favor

March of the Machine Commander

On an Adventure

Creature — Human Knight

Smitten Swordmaster

Game Night: Free-for-All

Enchantment — Aura

Enchant creature
Enchanted creature gets +2/+2, has menace, and can't attack you or planeswalkers you control. (It can't be blocked except by two or more creatures.)

Vow of Torment

Mystery Booster Playtest Cards 2021

Creature — Human Soldier

Baneslayer Aspirant gets +3/+3 and has flying, first strike, and lifelink as long as you have one or more emblems.

Baneslayer Aspirant

Kaldheim

Foretell

Creature — Human Cleric

Whenever you cast your second spell each turn, you gain 2 life.
Foretell {W} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)

Doomskar Oracle

Modern Horizons

Illusion

Creature — Human Ninja

Ninjutsu {2}{U} ({2}{U}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)
Whenever this creature deals combat damage to a player, create a 1/1 blue Illusion creature token with flying.

Moonblade Shinobi