Kozilek's Unsealing

The reward table is the whole design idea: this splits fat creature spells into two payoff bands, and the split is doing real work. Cast something in the four-to-six range and you get two Eldrazi Spawn, which are not just chump fodder but a pair of one-shot colorless mana rocks that can ramp you toward the next threat, feed a sacrifice engine, or block. Reach seven or higher and the enchantment abandons the token grind entirely and hands you three cards, no strings. The seam between those bands is deliberate: it rewards a curve that climbs rather than one that plateaus, and it triggers on the cast, not the resolution, so a countered Emrakul still refills your hand. Pinning the payoff to the cast rather than an enters-the-battlefield trigger is what lets it survive counterspells and removal aimed at the very creature it is celebrating. Devoid keeps it colorless in name even though it needs blue to cast, which is mostly a nod to the Eldrazi identity rather than a mechanical hinge, though it matters for any effect that reads color off the permanent. This is a cast-triggered enchantment built to pay you for what your deck already wants to do: play big, colorless, hungry things, and let the board and the hand fill themselves regardless of what the opponent does about the creature.