Elspeth, Knight-Errant is a mythic Legendary Planeswalker — Elspeth card from Modern Masters (MMA), collector number 13. Current market price: $9.14 (foil $16.80), TCGplayer market prices via Scryfall.
+1: Create a 1/1 white Soldier creature token. +1: Target creature gets +3/+3 and gains flying until end of turn. −8: You get an emblem with "Artifacts, creatures, enchantments, and lands you control have indestructible."