It makes cards like Aetherflux Reservoir incredibly easy to activate multiple times, and quite literally doubles the value of any lifegain source you have
Numerous mons have their retreat cost at 3 or more, and for them, this works as something like a Steel Apron, lessening the damage of attacks by 20
**Effect: You can Normal Summon 1 Level 8 or higher DARK Fairy-Type monster without Tributing
Even if it's removed immediately, you'll still have at least one spell left, making it hard to lose card advantage, and if it somehow stays on the board, you'll definitely have a significant advantage
These are called Field Cards
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