Every time Subordinate deals its full damage to opponents, that covers spells up to a mana value of nine with Abaddons ability
Likewise, it synergizes positively with storm subthemes, which are commonly found lacking, and grants support to a potential spells matter archetype (e.g., Guttersnipe, Gelectrode & Talrand, or even Kiln Fiend, Nivix Cyclops & Spellheart Chimera, depending on your preferences
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Also, Preordain might stand out a little, but youve got to remember the context
The biggest reason these cards are banned is that they allow situations for games to either become incredibly drawn out or aggressively unfun