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Card Details
Whenever one or more creatures you control fight or become blocked, draw a card.
At the beginning of combat on your turn, you may pay 
. If you do, double target creature's power until end of turn. That creature must be blocked this combat if able.
3/3
Illustrated by Magali Villeneuve
Rulings (8)
Jun 23, 2020
A creature "fights" when an effect instructs it to fight. Dealing combat damage isn't fighting.
Jun 23, 2020
If an effect instructs you to "double" a creature's power, that creature gets +X/+0, where X is its power as that effect begins to apply. If its power is negative, instead it gets -X/-0 where X is how far below 0 its power is. The value of X won't change if another effect alters the creature's power later in the turn.
Jun 23, 2020
If each creature the defending player controls can't block for any reason (such as being tapped), then the target creature isn't blocked. If there's a cost associated with blocking the target creature, the defending player isn't forced to pay that cost, so it doesn't have to be blocked in that case either.
Jun 23, 2020
If the target creature has menace, two creatures must block it if able.
Jun 23, 2020
Only one creature is required to block the target creature. Other creatures may also block it and are free to block other creatures or not block at all.
Jun 23, 2020
The defending player, not you, chooses which creature blocks the target creature.
Jun 23, 2020
While resolving Neyith's last ability, you can't pay multiple times to double a creature's power more than once or to double more than one creature's power.
Jun 23, 2020
You draw just one card as Neyith's first ability resolves, no matter how many creatures you control fought or became blocked.