A 3/2 flash lifelink creature would already be playable in a control deck looking to stabilize, but this one comes with Swords to Plowshares attached
Thoughtseize I can read your mind Thoughtseize is a one-mana card that forces your opponent to reveal their hand and then allows you to make them discard a nonland card of your choice
Speaking of Walking Ballista, I wasn't 100% sure how the interaction works ( Magic is weird, so it seemed possible that "entering the battlefield with counters" was somehow different than "putting a counter on" a creature), so I double checkednot only does Solemnity keep you from putting counters on creatures (as with Walking Ballista's ability), but it also makes it so artifacts, creatures, enchantments, and lands enter the battlefield without any counters as well
Mana Crypt took the ban for being too explosive
On the surface, the Instant Fate of the Sun-Cryst is a pretty typical Magic card, paying five mana to destroy any non-land permanent