Some cards that are great in two-player games (such as [c]Thoughtseize[/c]) become much less popular in four-player games since their overall impact is much lower
The alternate commander, The Lord of Pain, pings enemies for damage whenever a player casts their first spell, which is not only an excellent tool to make your opponents kill each other, but a decent deterrent to not remove them quickly
The back of these cards is in all other regards the same as other Magic cards
Having recursion is great, and though Mantle of the Ancients does a lot of heavy lifting, you need more than that
Jorn, God of Winter / Kaldring, the Rimestaff Apologies to Kaldring, the Rimestaff, but Jorn, God of Winters the real breadwinner here