Game Over {3}{B}{B}
Sorcery
This spell costs {2} less to cast if a player's life total is less than or equal to half their starting life total.
Destroy all creatures.
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Cards that do something similar expected a card that isn't here?
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Focus the Mind 81%
$0.24#9855
"This spell costs {2} less to cast if you've cast another spell this turn."
Rally the Monastery 81%
$0.25#12529
"This spell costs {2} less to cast if you've cast another spell this turn."
Blood Money 98%
$1.27#1649
"Destroy all creatures. For each nontoken creature destroyed this way, you create a tapped Treasure token."
Decree of Pain 98%
$0.28#1319
"Destroy all creatures. They can't be regenerated. Draw a card for each creature destroyed this way."
Kaya's Wrath 98%
$0.48#4082
"Destroy all creatures. You gain life equal to the number of creatures you controlled that were destroyed this way."
Deadly Tempest 97%
$0.78#3546
"Destroy all creatures. Each player loses life equal to the number of creatures they controlled that were destroyed this way."