Custodius, the Indomitable Guardian

CNT Ability

You may [DR3: OWL or Beast]. If you do, then special summon this into your attack zone.

Ability

Breakthrough, Enhance: OWL or Beast
■ "Moonlight Howling" - Turn 1 - Standard Action: [Put 1 of your charges into the graveyard.] Until the end of turn, all of your Beast and OWL cards in play gain +1 STK.

Like the tower it guards, this sentinel refuses to fall.