Dallinar, King of Urithiru

Radiant creatures you control get +X/+X where X
is the number of spren you control.

Eminance - Whenever you cast a radiant spell from your hand or the command zone you may search your library for a spren creature spell and put it into your hand, then shuffle your library.

“Tell my brother…he must find the most important words a man can say….” —Gavilar Kholin