Legendary Creature — Elemental Beast
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Marath enters with a number of +1/+1 counters on it equal to the amount of mana spent to cast it.

, Remove X +1/
+1 counters from Marath : Choose one —
• Put X +1/+1 counters on target creature. X can't be 0.
• Marath deals X damage to any target. X can't be 0.
• Create an X/X green Elemental creature token. X can't be 0.
The amount of mana you spent to cast this creature is usually equal to its mana value. However, you also include any additional costs you pay, including the cost imposed for casting your commander from the command zone.