Tilonalli's Summoner is a rare Creature — Human Shaman card from Rivals of Ixalan Promos (PRIX), collector number 121p. Current market price: $3.69 (foil $5.00), TCGplayer market prices via Scryfall.
Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.) Whenever this creature attacks, you may pay {X}{R}. If you do, create X 1/1 red Elemental creature tokens that are tapped and attacking. At the beginning of the next end step, exile those tokens unless you have the city's blessing.