In the hyper-efficient land of Legacy tempo, decks strive to land a threat and then trade away both players remaining cards as quickly as possible
Notice that it works at instant speed, so you can activate it during your opponent's turn
Gwafa Hazid, Profiteer Gwafa Hazid seems like a more offensive card in that it basically removes creatures from the game, but the way to use Gwafa is by allowing your opponents to draw cards at the cost of a creature, or acting like the weapon of the player who's the highest bidder
Better have a combat trick or a Lightning Greaves at the ready
Since she's also a Merfolk, you can also give her a boost with all the different Merfolk lords across all three colors
But with a lot of tramplers, dealing that damage might not even need blockers out of the way beforehand