Tama, Grand Contractor

Delve, Hexproof

If this creature's entire colourless cost was paid for
by Delve, Scry 4, then draw 4. Any artifact spells
drawn cost X less this turn, where X is equal to the amount of cards in your graveyard.

{1}, {t}: Pay for {1} of a spell's colorless cost this turn, this also counts towards paying for Delve abilities.