kor mtg cards Elas Il-kor, Sadistic Pilgrim Creature Sacrifice Life Drain Magic Commander Deck Whenever you cast an Aura spell Kor - MTG Wiki

And quite the princely card for three mana, too

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This mana lasts until end of combat.) Whenever Azula attacks, you may discard a card

That's a deck strat

Whenever a Symbiotic creature dies, it creates a number of 1/1 green Insect creature tokens equal to its power and toughness (which are always the same)

What makes these cards so rare is that they were never meant to find their way into players hands