yugioh spellcaster's command structure deck Yu-Gi-Oh! 5D'S English up Continuous Spell or Continuous Trap Card on the field. Yugioh structure deck Spellcaster Command,

It will always be most advantageous to have the deck be headed up by Sliver Overlord, I cant imagine Wizards can really ever top the Overlord, and I would be fine if they didnt try to

I'm not against using it to self mill to get a win with Jace, which sounds like it'd be a VERY good win con combined with Archmage Emeritus, Thousand-Year Storm and Veyran, Voice of Duality, or to fill the graveyard for me to cheat something out with Narset, but I wouldn't really consider that ideal in that circumstance because the ideal situation (in my mind, at least) is I'm using Narset to cast something twice

Devout Chaplain

This is how we get cards with 1 or more square corners

If you have two commanders, the last ability adds one mana of any color in their combined color identities