
VigilanceVigilanceAttacking doesn't cause this creature to tap.
When Casal enters, search your library for a Forest card, put it onto the battlefield tapped, then shuffle.
Whenever Casal attacks, you may pay . If you do, transformtransformTo mill a card, put the top card of your library into your graveyard. her.
VigilanceVigilanceAttacking doesn't cause this creature to tap., trampletrampleExcess combat damage it deals to a blocker carries over to the player or planeswalker it's attacking.
When this creature transforms into Casal, Pathbreaker Owlbear, other legendary creatures you control get +2/+2 and gain trampletrampleExcess combat damage it deals to a blocker carries over to the player or planeswalker it's attacking. until end of turn.
At the beginning of your upkeep, transformtransformTo mill a card, put the top card of your library into your graveyard. Casal.
Hover an underlined rule to see what it means.
Read from the rules text. A card that enables a keyword makes or is the thing; a card that rewards it gets better when you have it. Two cards interact when one enables what the other rewards.