All three options destroy multicolor decks
Emptiness Emptiness is what happens when you put an Unearth effect on an evoke ability
3 Alesha, Who Laughs At Fate Attack With Confidence 3 Mana Cost in Rakdos (Black/Red) Creature Alesha, Who Laughs at Fate is super fun to play with, offering an easy way to confidently attack thanks to first strike and its consistently growing army of +1/+1 counters
And while I dont see Morph as a build-around card that should necessarily have these kinds of support tools, we are seeing more defensive options added to the game with each new set
It's a great mana sink, it's a great long-game card, and it's fun for Jonnies to combo with as they blow the counters off with Giant Fan and similar effects
Flow State Expressive Iteration made some waves as a mix of a card selection and card advantage spell, to the point of being banned in formats like Legacy