You want to design the main effect to have an impact but not necessarily completely derail things, and this falls squarely into that category, allowing for voltron builds to get the maximum value without being totally useless for everyone else
Types of Cosmetics Chandra, Dressed to Kill | Illustration by Ekaterina Burmak Avatars Avatars are your main representation as a player aside from your deck
But for you, its a value machine
For the low, low cost of one card, you get to attack again, draw a card, and use all of your mana a second time, plus get a crack at additional upkeep/end step triggered abilities and all that good stuff
Because Ascended Heroes is a special set rather than a standard expansion, there are no traditional booster boxes
Yawgmoth's Will can be an absolute terror when played right, especially since it exists in the color that cares most about the graveyard