Dragon Tempest is a uncommon Enchantment card from Tarkir: Dragonstorm Commander (TDC), collector number 94. Current market price: $3.46, TCGplayer market prices via Scryfall.
Whenever a creature you control with flying enters, it gains haste until end of turn. Whenever a Dragon you control enters, it deals X damage to any target, where X is the number of Dragons you control.