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Master Yi, Wuju Bladesman
How to play Master Yi
Get a unit onto a battlefield early and defend it alone. The legend gives that lone defender +2 Might.
If they leave it, you score. If they send a similar-cost unit plus a spell, you trade up on cards. If they send a bigger unit, winning that showdown puts you far ahead.
Hold when you can. Use En Garde and similar spells to keep the defender alive outside combat. Once you have six runes, reactions get much easier.
Sources: Master Yi, Wuju Bladesman guide — Riftbound.gg · How to buy Riftbound