Keyleth

When Keyleth enters the battlefield and at the beginning of each player's upkeep, you may
transform Keyleth into one of the following
creatures until end of turn. Keyleth retains all
other abilities while transformed.
• Green 5/3 bear with trample.
• Red 6/1 cat with first strike.
• Blue 4/2 bird with flying.
If Keyleth would die while transformed, return
Keyleth to its base form instead.