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But Id argue that making yet another mechanic along those lines would be going back to the well too soon

Card Name Mana Cost Type Legendary Creature Avatar Wizard Rarity Mythic Rare rules Text FlashYou may cast legendary spells and artifact spells as though they had flash.If a legendary permanent or an artifact entering or leaving the battlefield causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time

The best way is to playtest with it

UR Ultra Rare Dark Balter the Terrible X DARK Level 5 [ FiendFusionEffect ] ATK 2000 DEF 1200 "Possessed Dark Soul" + "Frontier Wiseman" A Fusion Summon of this monster can only be conducted with the above Fusion Material Monsters

Sylvan Library (T1, Ext, S) The highest placing green card on the list