Reminder: CASOU

CASOU Level up X:
As a sorcery once per turn, pay X and place a
level up counter on the creature up to level 4.
The creature has all abilities of its current and previous levels. If it has different stats it must
have the most recent one. Triggered abilities
trigger when their level is reach and every level
after.
Teamwork:
If you control 4 or more creatures with different
Class:X types the Teamwork effect activates