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Nearly all of these cards are relevant and desirable for Constructed formats, and some are also worth serious money (for rares, that is)

By sacrificing creatures, Ayli allows her controller to gain life equal to a sacrificed creature's toughness

Then these decks are perfect for you

Hero's Blade is an Equipment from the Khans of Tarkir block that gives the equipped creature +3/+2, and if a legendary creature enters the battlefield, this sword can be equipped to it at no cost

The real power comes in, though, when the abilities are combined with Oko's three-mana casting cost and loyalty values

This is a bomb no matter how you cast it, and the modality is a huge upside