It's something you have to build around a little bit, but if you do, you have some really powerful recursion and a really straightforward engine to start getting pretty crazy value from sacrificing off your bigger creatures
A friend once said that even though there were only 4300 black bordered Lotuses ever printed, and that a lot of them may be lost to time, there probably exists more than 4300 black bordered Lotuses
2017-08-25 If you somehow control a Heralds Horn with no chosen creature type, no spells will cost less to cast, not even creature spells with no creature type
Even so, the odds of pulling Thought Vessel in a deck of 99 (excluding the commander, who goes into the command zone) are slim, so adding Reliquary Tower can increase your odds of having a limitless hand size
Sephiroth, One-Winged Angel is the whole reason I can put Sephiroth on this list and the transform condition is surprisingly easy to pull off