Pillow fort cards look to mitigate all incoming damage by either gaining life, incentivizing opponents to attack each other, or just flatly preventing the damage from happening
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Once while this card is face-up on the field, during the Main Phase (Quick Effect): You can send 1 card you control to the GY, then target 1 Effect Monster your opponent controls
Green decks have less ability to utilize dead cards in hand than red, blue or black so they like to play targets they have some hope of hard casting
What are the top Blue creature recursion cards in Commander
Considering that shrine decks are usually five colors, its a card that should see play in these decks, because its good at any point in the game