Someone behind Jasmine raised his hand .   “So you don’t want us to just draw in as much mana as possible and go out in a blaze of glory, right?” “On the contrary, you’ll be surprised how little mana it took to make one of my infamous soul bombs .   Rule number one in the use of Mana:   More mana does not necessarily make for a better spell, it’s what you do with the mana you have .   It requires planning your spells, something that is useful,” he glanced at Jasmine, “even to those predominantly in Red magic . ” Urza looked out the window of his tower classroom that overlooked a dammed river .   “Take this dam I’m looking at .   Assume that all the mana in Dominaria is held up by that dam, and you’re at the bottom needing to tap some .   How do you do it?” Someone from the back row thought it was time for a heckle .   “I suppose opening the floodgates is out . ” The heckle was lost on Urza .   As usual .   “Exactly .   You want to drink, not drown . Punching a hole by brute force will only get you a deluge that sweeps you away, and that hole will not be plugged up as easy .   That’s why considering what you want to do with the mana is important . ” Urza talked of pipes, valves, nozzles and other terms that has to deal with water . Jasmine thought at first that these words will just go in one ear and out the other, but she had another image that told what Urza was thinking but in a way she understood .   Not pluming but pottery .   Long before she came to the Academy, long before she even fell off that tree branch and had her spark light up when she hit the ground, she saw mana as clay on a potter’s wheel, and she can shape and mold it to whatever she willed .   What Urza was trying to teach her is finesse in the pottery making .