Mossborn Hydra
Creature — Elemental Hydra
Oracle Text
Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.) This creature enters with a +1/+1 counter on it. Landfall — Whenever a land you control enters, double the number of +1/+1 counters on this creature.Rules for this card
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A keyword action used in a variety of contexts. See rule 701.10, “Double.”
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Landfall Rule 207.2c
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A keyword ability that modifies how a creature assigns combat damage. See rule 702.19, “Trample.”
Rulings (5)
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Wizards of the CoastIf Mossborn Hydra somehow enters at the same time as one or more other lands you control, its last ability triggers for each of those lands.
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Wizards of the CoastA landfall ability doesn't trigger if a permanent already on the battlefield becomes a land.
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Wizards of the CoastTo double the number of +1/+1 counters on Mossborn Hydra, put a number of +1/+1 counters on it equal to the number it already has. Other cards that interact with putting counters on it will interact with this effect accordingly.
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Wizards of the CoastWhenever a land you control enters, each landfall ability of the permanents you control will trigger. You can put them on the stack in any order. The last ability you put on the stack will be the first one to resolve (As a result, you can have those abilities resolve in the order of your choosing.).
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Wizards of the CoastA landfall ability triggers whenever a land you control enters for any reason. It triggers whenever you play a land, as well as whenever a spell or ability puts a land onto the battlefield under your control.