As long as Astra is prepared, whenever you cast a noncreature spell you may pay {E}. If you do, draw a card.

Whenever Astra enters or attacks, you get {E}. Then, you may discard a card. If you do, Astra becomes prepared.

2/2

Storm Circuit{U}{R}

Sorcery

Target creature gains trample and gets +X/+0 until end of turn, where X is the amount of {E} you have.