Magus of the Order

The lineage runs straight back to Natural Order: pay green, sacrifice a creature, and drop your best green threat onto the battlefield directly. This is that effect stapled to a 3/3 body, and the trade the creature form makes is worth reading carefully. Natural Order was a sorcery, gone the moment it resolved; wrapping the same effect around a Human Wizard does not make it repeatable, because the activation cost sacrifices the Magus itself alongside a second green creature. What the body buys instead is presence and timing. The effect now occupies the board as a 3/3 while the sacrifice fodder assembles, and it converts the fetch into an instant-speed operation off a single green mana, dodging the counterspell window a hardcast fatty walks into. The cost is heavier than the sorcery's ever was: a full turn of summoning sickness before the ability can fire, two green bodies fed to the mechanism (the Magus is one of them, so it goes to the graveyard the moment it works), and a threat that telegraphs itself the turn before it fires. What it retrieves is unbounded, since the search reads "a green creature card" with no mana-value cap, so the ceiling is whatever the deck's most game-ending green creature happens to be. That is the enduring appeal of this class of tutor and the reason it keeps getting revisited in creature form: two expendable green bodies and one green mana become your best threat, already in play.