Reminder: CASOU

CASOU Level up X:
As a sorcery, 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