Delvefall
Wall Off

Wall Off {3}{W}

Instant

This spell costs {1} less to cast for each creature your opponents control.
Create a 0/4 colorless Wall creature token with defender. You gain 4 life.

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extra filters

color identity, fits-within like deckbuilding: tick W and U and only white, blue, white-blue and colorless cards show. in the filter box: id:wu (or -id:rg to ban colors), or id:c for colorless only

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price bounds, in the currency picked below. cards with no listed price are hidden by any price filter. in the filter box: usd<=5, eur>=1

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mana value bounds (converted mana cost). in the filter box: mv<=2, cmc>=4, both spellings work

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only legendary creatures, the cards that can lead a commander deck

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Cards that do something similar expected a card that isn't here?

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Even the Odds
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Avatar of Growth
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"This spell costs {1} less to cast for each opponent you have."