No, the disguise cost is a knob the designers can turn and tweak as needed and has a wide range
Mount Doom Another legendary land, Mount Doom has a growing scale of abilities that help you control the board
But you could go for a more casual, Voltron-style deck that asks how many copies of Monstrous Rage and Dreadmaw's Ire it takes to win a game of Magic
It works especially well alongside cards like Archaeomancer that can pick it back up, which lets you create loops of card advantage while you keep your graveyard fueled
A two mana 1/1 with Prowess is pretty bad, and while Haste and a cost reduction effect are nice, this doesn't do quite enough to overcome the bad baseline to be a really exciting signpost uncommon
A bit more mundane than the scores of horrors and demons we've just gone through in both Black and Blue, but I do like the idea of a giant grinning snake-hallucination with hands tormenting someone and screwing over their head