Flash
Instant
You may put a creature card from your hand onto the battlefield. If you do, sacrifice it unless you pay its mana cost reduced by 
.
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Printings (3)
Combos (8)
- Polyraptor + Aether Flash
→ Draw the game, Infinite creature tokens, Infinite ETB
- Sprouting Phytohydra + Aether Flash
→ Infinite ETB, Infinite LTB
- Kiki-Jiki, Mirror Breaker + Thornbite Staff + Aether Flash
→ Infinite death triggers, Infinite ETB, Infinite LTB
- Aether Flash + Nature's Revolt
→ Destroy all lands that enter the battlefield, Lock, Mass Land Denial
- Yarus, Roar of the Old Gods + Ashcloud Phoenix + Aether Flash
→ Near-infinite damage to all players, Near-infinite death triggers, Near-infinite ETB
- Aether Flash + Living Plane
→ Destroy all lands that enter the battlefield, Lock, Mass Land Denial
Rulings (4)
- 2018-03-16
If the creature has
in its mana cost, X is considered to be 0. - 2018-03-16
Only the generic mana in that creature's mana cost is reduced. For example, if that creature's mana cost is
, you'll have to pay to keep it. - 2018-03-16
The creature enters the battlefield, so it will trigger enters-the-battlefield abilities even if you choose not to pay.
- 2018-03-16
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 it leaves the battlefield, and those abilities will be put onto the stack at the same time as those that triggered when it entered the battlefield.