Byleth, Professor of War

Haste, Vigilance, First strike
When Byleth enters the battlefield, put two
+1/+1 counters on target creature(s) you control.
{3} Teach 1. (Give the teacher +2/+2. If there
are any creatures with base p/t 2 or less under your control, put a +1/+1 counter on them.)
{6}{w}{w}{w}, Exile Byleth. Search your library for
a card named Byleth, the Enlightened and put it on the battlefield tapped.
You can play this card from exile if a card named Byleth, the Enlightened is in a graveyard.