Planeswalkers don't stick around in Commander that often, especially ones that need to survive three or more turns to use their ultimate
Become the Avalanche Say you manage three creatures where their power matters, Become the Avalanche drew you three and got you at least +3/+3
The Curse is an aura that turns the enchanted creature into a 6/5 trampling penguin
Rakdos Changelings Even though red provides plenty of Dragons to round out the deck, creatures with the changeling ability are nice ways to tie together the commanders that care about two creatures types: Rohgahh, Kher Keep Overlord especially, but potentially also Bladewing, Deathless Tyrant
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You can even use Muldrotha, the Gravetide as a combo piece alongside Displacer Kitten and some 0-cost artifacts