Some of them act exclusively as payoffs or ways to improve your other payoffs
Whenever CARDNAME deals combat damage to an opponent, draw a card
Meanwhile, Archmage of Runes not only draws cards the same way, but it also makes your spells cheaper, turning every cantrip into a little engine
This card drew some bizarre comparison with Bitterblossom, in the sense that youre making the 1/1s and losing life each turn
Some time goes by and they realize they miscaluculated the amount of Holo cards they needed stamped, so some shadowles holo sheet go back and get Thin 1st edition stamps applied
As a general rule, Im happy if I draw cards equal to these cards mana cost, but am ok with drawing one less