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Boreal Outrider
Snow Creature — Elf Warrior
Whenever you cast a creature spell, if snow mana of any of that spell's colors was spent to cast it, that creature enters with an additional +1/+1 counter on it. ( snow mana is mana from a snow source.)
Rulings (8)
Snow is a supertype, not a card type. It has no rules meaning or function by itself, but spells and abilities may refer to it.
Feb 5, 2021
Some cards have additional effects for each snow mana spent to cast them. You can cast these spells even if you don’t spend any snow mana to cast them; their additional effects simply won’t do anything.
Feb 5, 2021
If you control multiple Boreal Outriders, each of their triggered abilities will trigger separately. A creature could enter the battlefield with multiple +1/+1 counters on it this way, even if you spent only a single snow mana of the appropriate color(s) to cast the creature spell.
Feb 5, 2021
Legality
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