Dragonkin Soldier of Nokstella

Flying, Trample

Whenever Dragonkin Soldier of Nokstella deals
combat damage to a player, create a treasure token.
As long as this creature is on the battlefield, Dragon
spells and creatures can be cast for their original total
mana cost in treasure tokens minus 2. If the cost of
the card would be 0 tokens or less, it defaults to 1.

"The Dragonkin were born in the Eternal City, where
they knew no true sky."