Lets see how many of these you have played
Zhulodok is a 7/4 for six, which isnt bad, but it also gives all your high-cost colorless spells double cascade
Exsanguinate Exsanguinate is one of the most played black finishers in EDH
Rather than a new card with a similar theme, it uses a stained glass planeswalker, which are bonus cards used in a variety of Secret Lairs, making them an unnoteworthy inclusion
Heliod, the Radiant Dawn / Heliod, the Warped Eclipse Heliod, the Radiant Dawn is just an oversized Auramancer, but transform this baddie and you get Heliod, the Warped Eclipse, a Phyrexian god that converts opponents card draw into cost reduction for your spells
It was balanced for Standard and Draft where it was always a good but clearly not broken mechanic