Dragonskull Coliseum enters the battlefield tapped.
: Add or to your mana pool.
: Add to your mana pool. Put Dragonskull Coliseum on top of your library.
At the beginning of your upkeep, sacrifice a Rat.
: Add 
or 
to your mana pool.: Add 
to your mana pool. Put Dragonskull Coliseum on top of your library.
