Theyre a four mana Black, Green, and Blue 2/3 with deathtouch that you can tap to add two mana of any one color
Sure, there are still plenty of spells that are jokey, parasitic, or will otherwise probably not do all that much beyond Unstable s short-lived time as a draft set, but there are also a bunch of interesting cards that will make the leap into Commander and Cube
The second tradeoff is that many cards are designed around removing Special Energy or punishing your opponent for using it
Marneus Calgar, in particular, could employ Hildibrand to strong effect
For example, if you choose Ondu Knotmaster, Throw a Line will still cost only to cast.
Enchanted creature cant block creatures with power equal to or greater than the enchanted creatures toughness