mtg isshin two heavens as one commander deck Let's Build a High-Powered Isshin, With dimensions of approximately 24 in Isshin, Two Heavens as One

Potential Infinites There are a few infinite loops in here to generate all the landfall we could ever need - the Temur Charger can be turned face up at the cost of revealing a green card from hand, so anything that costs 1 to sacrifice it can be looped by paying the 1 and sacrificing it, returning it as a land, tap for 1 green, morph for 0 mana, then paying the 1 and sacrificing it, ad infinitum

Golgari Keyrune

You cast Whispers, buy it back for 5 mana, and you draw one card for free

Set the scene for your opponent's greatest fears to come to life as shadows turn lethal

The other top deck is the Nykthos Ramp deck

You know how Black Market Connections is pretty much a better Phyrexian Arena