With This Treasure I Summon...

As an additional cost to cast this spell, tap two
artifacts and/or Spirit creatures you control.
Choose one:
• Search your library for a Spirit creature card
and put it into your hand, then shuffle and draw
a card.
• At the beginning of your next precombat main
phase, add {b}{b}{b}{b}{b}. Spend this mana only to
cast your commander.