I haven't really used riftwing much but the scavenger ability isn't that bad. Personally I try to put in a monster with thorns in front if I can for any little league matches. It just seems to be more likely that the opponent will have a decent amount of melee monsters.
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Riftwing is great especially against melee monsters without sneak abilities. I use thorn monsters too, but in small mana games it's hard to fit in so little.
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The thorns monster for the little league requires you to level up your summoners so it's a bit tough.
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