When Yasharn enters, search your library for a basic Forest card and a basic Plains card, reveal those cards, put them into your hand, then shuffle.
Players can't pay life or sacrifice nonland permanents to cast spells or activate abilities.
Yasharn is a midrange hatebear that taxes life-payment and sacrifice effects while ramping you off its enter trigger. You deploy it to shut down opposing fetch lands, Phyrexian mana, sacrifice combos, and free-cast cards, then grind out the game with efficient creatures and value. Win by going wide or big with green/white beaters while opponents stumble under the lock.
Powerful asymmetric hatepiece that cripples aristocrats, fetchlands, Phyrexian mana, and many infinite sacrifice combos
Replaces itself with two basic lands, smoothing mana and never being a dead draw
Cheap to cast at four mana with a relevant 4/4 body in GW
Stops Ad Nauseam, Phyrexian-mana counterspells, and sac-for-value engines in cEDH and high-power tables
Easily removed since it has no protection or evasion
The static ability can disrupt your own sacrifice/life synergies if your deck isn't built around it
GW lacks card draw and interaction compared to other color pairs
Largely a value/hate creature, not a standalone game-ender
Turns your basics and ramp into a massive token army for a quick wide win.
Lean into fast mana and taxation (Sol Ring, Smothering Tithe, Esper Sentinel) so you outpace opponents while Yasharn slows them. Add the best GW interaction—Swords to Plowshares, Path to Exile, Mana Tithe—and tutors like Green Sun's Zenith and Eladamri's Call to find Yasharn reliably. Finish with a compact combo such as Heliod plus Walking Ballista, since infinite-sacrifice lines are off the table under your own commander.