Cards like Rhystic Study and Mystic Remora are staples in high-power Commander
Six mana to copy a creature you control is a lot, but as someone who plays a Kiki-Jiki, Mirror BreakerKiki-Jiki, Mirror Breaker deck, I cannot express enough how amazing it is to copy your most powerful creature over and over again
The History of For Mirrodin
Whenever you attack with one or more Creatures, you can add that much mana using any combination of Red and Green, and that mana doesnt empty from your pool until end of turn
Amazon labels it 34% off MSRP, but given how pricey these decks have been, thats underselling it
Vadrik gives you a discount on your instants and sorceries equal to its power, and it gains a +1/+1 counter whenever it becomes day or night