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There's other support cards that can make getting Valkyrion on the field easier so you don't always have to rely on the one presented to you

(Exile this card from your graveyard: Create a token thats a copy of it, except its a 4/4 black Zombie in addition to its other types with no mana cost

With token-makers like Elvish Promenade, you can wipe out threats or strip planeswalkers clean

While piloting the Golgari Yawgmoth deck, Ive regularly ruined an opponents board simply by killing off their creatures/shrinking them enough to make attacking unprofitable, and Ive even proliferated an opponents Chalice of the Void from one to two to lock them out of casting a bunch of spells