Hateflayer

Text:

Wither (This deals damage to creatures in the form of -1/-1 counters.)
, {Q}: Hateflayer deals damage equal to its power to any target. ({Q} is the untap symbol.)

Rulings:

• 8/1/2008 If the permanent is already untapped, you can’t activate its <img src="/Handlers/Image.ashx?size=small&amp;name=untap&amp;type=symbol" alt="Untap" align="absbottom" /> ability. That’s because you can’t pay the “Untap this permanent” cost.
• 8/1/2008 The “summoning sickness” rule applies to <img src="/Handlers/Image.ashx?size=small&amp;name=untap&amp;type=symbol" alt="Untap" align="absbottom" />. If a creature with an <img src="/Handlers/Image.ashx?size=small&amp;name=untap&amp;type=symbol" alt="Untap" align="absbottom" /> ability hasn’t been under your control since your most recent turn began, you can’t activate that ability. Ignore this rule if the creature also has haste.
• 8/1/2008 When you activate an <img src="/Handlers/Image.ashx?size=small&amp;name=untap&amp;type=symbol" alt="Untap" align="absbottom" /> ability, you untap the creature with that ability as a cost. The untap can’t be responded to. (The actual ability can be responded to, of course.)
• 8/1/2008 Wither applies to any damage Hateflayer deals to a creature, which includes both its combat damage and damage from its activated ability.