Glacial Crasher {4}{U}{U}
Creature — Elemental
Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
This creature can't attack unless there is a Mountain on the battlefield.
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Cards that do something similar expected a card that isn't here?
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Goblin Rock Sled 95%
$0.06#30506
"This creature can't attack unless defending player controls a Mountain."
+1 more matching line
Harbor Serpent 88%
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Bloodcrazed Goblin 88%
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Goblin Cohort 87%
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Mogg Conscripts 87%
#27105
"This creature can't attack unless you've cast a creature spell this turn."
Orcish Conscripts 87%
#30294
"This creature can't attack unless at least two other creatures attack."
Crown-Hunter Hireling 87%
$0.18#24193
"This creature can't attack unless defending player is the monarch."
Silburlind Snapper 86%
$0.04#26997
"This creature can't attack unless you've cast a noncreature spell this turn."
Vantress Gargoyle 85%
$0.32#11501
"This creature can't attack unless defending player has seven or more cards in their graveyard."
River Serpent 84%
$0.21#18500
"This creature can't attack unless there are five or more cards in your graveyard."
Scarred Puma 84%
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Ronom Serpent 84%
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"This creature can't attack unless defending player controls a snow land."