Tiragarde's Ship Graveyard

{t}: Add {u} or {b} to your mana pool.
{t}: Tap target artifact or creature. Activate this ability only if there are three or more artifacts in
your graveyard.
{4},{t}: Exile a creature card from your graveyard. Create a Treasure artifact token. Activate this
ability only if there are three or more creatures in
your graveyard.