Tilonalli's Summoner [Rivals of Ixalan]

Description

Set:	Rivals of Ixalan
Type:	Creature — Human Shaman
Rarity:	Rare
Cost:	{1}{R}

Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.)
Whenever Tilonalli's Summoner 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.