Bant Prelude

When Bant Prelude enters the battlefield, each opponent gains 10 life.
Whenever you cast an instant or sorcery spell,
put a verse counter on Bant Prelude, then search
your library for a creature with converted mana
cost equal to the number of verse counters on
Bant Prelude divided by 2 (round up) and put it
onto the battlefield tapped.