Maybe some kind Dimir discard ramp control deck, so your opponent does not have the cards to take advantage of the free spell part
Korlessa, Scale Singer Korlessa, Scale Singer is the first of many multicolor dragon commanders
Krark's Thumb Krark's Thumb is a staple for any deck built around flipping coins
Stylish Exterior with Soft Interior:The strong magnetic closure ensures a secure seal, and the exterior features a beautiful textured finish,providing not only excellent protection but also a touch of style for your cards
And then her ultimate is very high -9 and she can give a player a cap of 9 poison counters, and then 0 and kill next turn if she is still alive
Of course, if a creature already has double strike and can give double strike to others, theres no impediment