When Aerith Gainsborough dies, put X +1/+1 counters on each legendary creature you control, where X is the number of +1/+1 counters on Aerith Gainsborough
The card has even appeared on the Game Changers List
One of the best applications is to cast a planeswalker and ultimate on the first turn since the counters are doubled on ETB
Kozilek, the Broken Reality Weve got our first titan on the list with the legendary Kozilek, the Broken Reality
Megrim Megrim is an enchantment that complements a discard strategy well, and its devastating with wheels alongside Nekusar, the Mindrazer as your Grixis wheel commander
Currently, Morophon goes for a modest $5 on the low end, so this isnt a high-value reprint