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Battskull is also perfectly playable on its own all be it in rather less wide a range of places

You just need another creature of yours to be untapped

There are two targeted removal spells that cost two at instant speed (Disenchant, Terror) card draw (Braingeyser), recursion (Regrowth) and you can make a Dragon

It's not a great trade in terms of card advantage, but if you can turn your Ambush Wolf into a timely Froghemoth, you might not need those extra cards anyway

The Grim Captain's Locker can let you cheat the mana cost on creature cards in your graveyard, casting something absurd like Atraxa, Grand Unifier from your graveyard for only 4 mana