Of course, you will need a strong base of Giant creatures to stay on board for this effect to work, which shouldn't be too hard in the Kaldheim meta, where Giants are favored not only in quantity, but also in quality
Most of the time, the search is useless the cards are long gone or the discovery disappoints
This leaves your opponent completely defenseless and sets you up perfectly for victory
Since then, Stoneforge Mystic has seen play in multiple different archetypes from UW Control as a quick way to close a game, to one of the most aggressive decks of the format, Hammer Time
Your monsters cannot attack the turn this effect is activated
Change it to face-down Defense Position, and if you do, its controller gains 1000 LP