Impetuous Protege [Battlebond] Snake Lamia Chief Engineer enters the battlefield

Chief Engineer enters the battlefield or another creature dies

Set: Unfinity Type: Artifact — Attraction Rarity: Uncommon Visit — Choose “an elf or goblin

Set: Starter Commander Decks Type: Token Creature — Elephant Rarity: Common

but I've never seen anything like it

{2}{U}{B}: Until end of turn

Impetuous Protege [Battlebond] Snake Lamia Chief Engineer enters the battlefieldSet: Battlebond Type: Creature Human Warrior Rarity: Uncommon Cost: {2}{R} Partner with Proud Mentor (When this creature enters the battlefield, target player may put Proud Mentor into their hand from their library, then shuffle.) Whenever Impetuous Protege attacks, it gets +X +0 until end of turn, where X is the greatest power among tapped creatures your opponents control.