Cven

Wasp gets multiple utility (free bounce for Toxin, free slot for Wolfsbane, free dig with Blink), and 4 of the cards are cheaper with Ravonna (Toxin, Wolfsbane, Cerebro, Mystique). Wave lets you drop Onslaught early, which can be used to double Ravonna's effect, making all 4 of those cards 1-cost. You can still fit Cerebro/Mystique on the Onslaught lane in that case as well. That means all your 7s become 15-power (or 39[?], if you can copy Onslaught instead of Cerebro).