To play a deck equally reliant on all three colors of mana is possible, but difficult
The new card, Ashcoat, is a legendary creature you could place at the helm of a rat tribal deck
Omega, Heartless Evolution Omega, Heartless Evolution is a beast at lower power levels where you can flicker your commander or use Panharmonicon and similar effects to lock your opponents out of the game with stun counters
Unfair Stamp has only been printed once, so its especially vulnerable to this surge in demand
On turn five, it's so strong that even if a few sit around in your hand early you're in good shape precisely because you can cast it on turn five
(It's also not an enchantment they can kill to get their dork back, by the way) But by discarding it for an effect, you net the effect as well as a powerful madness theft of something at instant speed that can change the tables very quickly