When Shelldock Garrison enters the battlefield, sacrifice it unless you pay .
: Add or to your mana pool.
Sacrifice Shelldock Garrison: Add or to your mana pool.
, : Shelldock Garrison deals 1 damage to target attacking creature.
.
: Add or 
to your mana pool. or to your mana pool., : Shelldock Garrison deals 1 damage to target attacking creature.
