The Second Generation of Phyrexian Praetors (DMU, NEO, SNC, ONE) Urabrask, Heretic Praetor Jin-Gitaxias, Progress Tyrant Elesh Norn, Mother of Machines Vorinclex, Monstrous Raider Sheoldred, the Apocalypse The Phyrexian praetors have a good ability for you and deny a good ability from your opponent in a mirrored way (e.g.: buff your creatures, shrink theirs, double your counters, halve their counters)
As Ratonhnhakton can only kill one opponent at a time with Commander damage, and takes incredible amount of set up to do so, its best not to be the aggressor in a table of 4
Proliferate is as powerful as it is salt-inducing
I think there are certain limitations to putting Brought Back into control decks