Goatnapper

This is the rare creature whose entire enters-the-battlefield trigger fires blanks unless a Goat is on the battlefield somewhere. It belongs to a thin design lineage of cards that legislate against an absurdly specific subtype, written deliberately tongue-in-cheek: the joke is that the ability is real, mechanically functional, and almost never live. The body is unremarkable and the trigger asks for a board state that exists in roughly no games, so the card functions less as a playable and more as a punchline that happens to obey the comprehensive rules. When the conditions do align (a clash of Goat-heavy boards, or a deck assembled expressly to make the steal happen), the effect is genuinely strong: untap a Goat, take it for the turn with haste, swing or sacrifice it before it returns. That alignment is the entire wager. Strip away the Goat clause and you have a worse version of the standard "steal a creature until end of turn" template; bolt the Goat clause back on and you have a design that exists primarily to be funny in a vacuum and brutal in the one matchup nobody plans for. It is a monument to a kind of tribal-design whimsy that does not survive playtesting on rate alone, which is precisely why it had to be built as a gag.