Regardless of the game youre playing, Cyclonic Rift always gives you asymmetric value, since it simply cant hit your permanents (without someone flashing in Dualcaster Mage or the like)
These cards usually have very powerful abilities, but can sometimes be underwhelming if they can't use their abilities
Go beyond the delirium from Duskmourn and you run across the lhurgoyfs
With Ajani, the Slasher takes the opponent from 20 life to three life: Slasher deals two, putting the opponent to 18
The extra bonuses granted by 20 and 40 toughness are just gravy, and you can try to accomplish that if youre building around this card
Buff Ojer Axonil, or just stack up a board full of things like Impact Tremors, Cavalcade of Calamity and Purphoros God of the Forge and watch life totals melt