Barrin, Tolarian Archmage [Core Set 2021] Beholder if a "Crystal Beast" monster

if a "Crystal Beast" monster you control battles and you would take damage: You can send 1 "Crystal Beast" monster from your Deck to the GY

Set: Ravnica: City of Guilds Type: Instant Rarity: Uncommon Cost: {G}{G}{W} Search your library for up to three creature cards

Mekk-Knight

also damage calculation for this battle uses each monster's original ATK and DEF

Set: Unlimited Edition Type: Creature — Skeleton Rarity: Common Cost: {1}{B} {B}: Regenerate Drudge Skeletons

Barrin, Tolarian Archmage [Core Set 2021] Beholder if a "Crystal Beast" monsterSet: Core Set 2021 Type: Legendary Creature Human Wizard Rarity: Rare Cost: {1}{U}{U} When Barrin, Tolarian Archmage enters the battlefield, return up to one other target creature or planeswalker to its owner's hand. At the beginning of your end step, if a permanent was put into your hand from the battlefield this turn, draw a card. "There is no age at which you stop learning."