Collecting all four pieces in the wild is harder than it sounds individual V-UNION fragments circulate separately, and matching copies (same print batch, same condition) command a premium
Ratchet Bomb turns a token board into a hecatomb and is a decent quasi-Deed, but it could use backup
Now, the card at least gives you that bit of value regardless of whether you control other creatures or not
This is doubly true of typal payoffs that care about how many of the supported type of creature you control, or ones with creaturefall effects that want to see more bodies enter the battlefield
Arena-exclusive cards were introduced for the New Player Experience to help introduce new players into normal gameplay
In practice, Affinity lets us cast multiple spells with improvise mana, while improvise limits us to one per turn