Blightsteel Colossus
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Ayli, Eternal Pilgrim firmly forces that Venn diagram into a circle with a combination of lifegain and interaction that gives you plenty of chances to sacrifice other creatures for varying amounts of mana
As a result, cards like Maskwood Nexus can be super effective, making it quite difficult for your opponents to remove your enormous threats without things cascading out of control
Your creatures are going to be exceedingly hard to remove permanently, and when they do come back, theyll bring friends
When I put this deck in TappedOut.net, that was the nominal Commander listed for the deck, but for our non-legendary Commander game it was Shimmer Dragon in the Command Zone