Aligned Heart is a rare Enchantment card from Tarkir: Dragonstorm Commander (TDC), collector number 52. Current market price: $1.12, TCGplayer market prices via Scryfall.
Flurry — Whenever you cast your second spell each turn, put a rally counter on this enchantment. Then create a 1/1 white Monk creature token with prowess for each rally counter on it. (Whenever you cast a noncreature spell, the token gets +1/+1 until end of turn.)