Elspeth, Knight-Errant is a mythic Legendary Planeswalker — Elspeth card from Secret Lair Drop (SLD), collector number 701. Current market price: $6.97 (foil $8.06), 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."