Will of the Naga is a common Instant card from Fate Reforged (FRF), collector number 58. Current market price: $0.05 (foil $0.19), TCGplayer market prices via Scryfall.
Delve (Each card you exile from your graveyard while casting this spell pays for {1}.) Tap up to two target creatures. Those creatures don't untap during their controller's next untap step.