The hard part is getting it into play, but it's well worth actually spending seven mana on
To do this, commons like Goblin Medics (which deals 1 damage to any target whenever its tapped) and even Village Bell-Ringer (who has flash, and untaps all creatures you control when it enters the battlefield) will keep you from feeling like you're wasting all your creatures as, effectively, an alternate mana source
One of the best stax commanders, Urza breaks parity on some of the strongest cards in the game while serving as an infinite mana outlet, and the token it creates can beat down, too
It wont win you the game on its own, either, so building around it feels meme-y at best
Holy Mantle
Cursed Mirror copies exactly what was printed on the original creature (unless that creature is copying something else or is a token