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Lightning, Lone Commando (Isshin, Two Heavens as One) Rating: 2/10 Isshin, Two Heavens as One naturally lives and dies by what kinds of attack triggers you have access to, because a 3-color vanilla creature is clearly unplayable

Once cards are exiled with the delve ability the cost reduction is already applied to the delve spell being cast, so theres nothing to be responded to

Entangler is not part of the Reserved List, so WotC could reprint it at any time with no problems

Mogis, God of Slaughter If Im being entirely honest, I think Mogis, God of Slaughter could be better

While youre at it, use Koth of the Hammer and Valakut, the Molten Pinnacle so each of those mountains can become direct damage