Gaston is spending his second two to use Mighty Leap as a removal spellessentially a Doom Blade that also prevents your creature from dealing damageto kill off that Sable and keep his Glory Seeker
You get better results with a scalpel, but you have to be super careful
The idea is simple: Get ahead on the board, then wipe everyones mana so the opponent cant catch up
When storyborn or dreamborn glimmers encountered this mixed ink, they surged with a power that changed them, transforming them into floodborn glimmers
Turning a random thrull into 2 colorless or 1 colored mana gives you all the ramp you need to make your deck function while stacking invaluable triggers from your sacrifice payoffs
This also impacts our typical understanding of draft archetypes rather than UW being the party deck, RG being the landfall deck and so on, the average draft deck ends up with its own unique mix of mechanics and payoffs to juggle