Coevolution
If matching card is New, summon card from your deck of higher rarity than the matching card
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Effect
If matching card is New, summon card from your deck of higher rarity than the matching card
Note
Could have variations of this – summon card of matching card rarity +1 (not sure how to describe that briefly, though), or summon card no less rare than the matching (and then have this card's rarity be common to balance it). Would be an interesting addition for rare decks.