Caller of the Untamed is a rare Creature — Elf Shaman card from Conspiracy: Take the Crown (CN2), collector number 62. Current market price: $0.22 (foil $1.18), TCGplayer market prices via Scryfall.
Before you shuffle your deck to start the game, you may reveal this card from your deck and exile a creature card you drafted that isn't in your deck. {X}, {T}: Create a token that's a copy of a card you exiled with cards named Caller of the Untamed. X is the mana value of that card.