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The defending player can prevent damage to their Planeswalkers the same way theyd prevent attacking creatures from dealing damage to them: by blocking the attack with their creatures or by using an instant-speed spell to remove the attacking creatures

It was a work around for a very large set of cards and rules that prevented having to change one of the game's most fundamental rules.

Commanders like Zedruu, the Greathearted actually play this as a wincon

Bishop of Rebirth

Having both on one card is invaluable

This Instant card has 3 mana value, which automatically triggers Yshtolas 2 damage ping to enemies and 2 life restoration for you