Peema Aether-Seer is a uncommon Creature — Elf Druid card from Aether Revolt (AER), collector number 119. Current market price: $0.17 (foil $0.24), TCGplayer market prices via Scryfall.
When this creature enters, you get an amount of {E} (energy counters) equal to the greatest power among creatures you control. Pay {E}{E}{E}: Target creature blocks this turn if able.