Flash

Instant    (CMC:2)

Put a creature card from your hand into play. You may pay its mana cost reduced by up to . If you don't, sacrifice it.

67 6E • ENDavid Ho

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Legal in: Mirage Block,Freeform,Tribal Wars Legacy,Commander

Oracle Text (click to copy):

10/4/2004
Any X in the creature's mana cost is zero.
10/4/2004
The mana cost you pay includes colored mana.
5/1/2007
The creature enters the battlefield, so it will trigger enters-the-battlefield abilities even if you have chosen to not pay.
10/1/2009
If you choose not to pay, the creature is sacrificed immediately. No player will get priority in between the creature entering the battlefield and being sacrificed. Sacrificing the creature this way will trigger any abilities that trigger when a creature leaves the battlefield.