Misunderstood Trapeze Elf is a common Stickers card from Unfinity Sticker Sheets (SUNF), collector number 5. Current market price: $7.40, TCGplayer market prices via Scryfall.
{TK}{TK} — Whenever you cast a spell, this creature gets +X/+X until end of turn, where X is the amount of generic mana in that spell's mana cost. {TK}{TK}{TK} — Hexproof {TK}{TK} — 4/2 {TK}{TK}{TK}{TK} — 6/6