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Timber Paladin's abilities each overwrite any previous effects that set creatures' power and/or toughness to specific numbers

Animar, Soul of the Elements feels like the most obvious choice, synergizing extremely well with all of the high-cost creatures in this deck while also resisting common targeted removal

But if you want some more Commander shenanigans, Narfi's second ability is the way to go

Altar of Dementia is one I always pack in a deck like this, because it lets you play my favorite reanimator card: Living Death is great in a list like this, because all of the creatures you sacrifice to it will create token copies, which makes it hilariously one sided

Keep in mind that all of these combos rely on pulling cards you only have one of in the deck, so you won't be able to reliably play all of these combos every game