Instant, 2UU (4)
Common
Counter target creature spell.
Draw a card.
"I can think of worse ways to go. On second thought, maybe not."
—Ludevic, necro-alchemist
Illus. Clint Cearley

1/22/2011: If the creature spell is an illegal target (because it's left the stack, for example) when Bone to Ash tries to resolve, Bone to Ash will be countered and none of its effects will happen. You won't draw a card.
1/22/2011: A creature spell that can't be countered by spells and abilities is a legal target for Bone to Ash. The creature spell won't be countered when Bone to Ash resolves, but you'll still draw a card.
Legal in Vintage (Type 1)
Legal in Legacy (Type 1.5)
Legal in Extended (Type 1.X)
Legal in Standard (Type 2)
Legal in Classic (MTGO)
Legal in Commander
Legal in Modern