mtg phyrexia all will be one commander precons The Compleat Precon Review for Phyrexia: unbeatable prices! Rankings for All 36 Phyrexia:

Outpost Siege is certainly the best at generating resources, but this deck does not have anything in the late game as powerful as Soulfire Grand Master loops, and I doubt Outpost Siege reverses the arrow of inevitability in our favor, so I favor something aggressive

I think its also the trigger that Ive forgotten as often as Ive remembered

If you want to play more of a controlling deck, Talrand, Sky Summoner is the right Merfolk for the job

Lets lay out which are which, in terms of rarity and frame

Untap away my princes, untap away

Attach auras and equipment to both creatures and they can deal even more damage to an opponent because of their ability, perhaps to the point of one-shotting them depending on their life total