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Additionally, Descent of the Dragons can also be used to buff for your side of the battlefield

For abilities marked "(OPTIONAL)" the same right-click lets you set an auto-yield so you don't get prompted on subsequent activations

Karrthus is a decent example of a high-powered legend that immediately pressures life totals, but there are cheaper examples like Maarika, Brutal GladiatorMaarika, Brutal Gladiator, Kresh the BloodbraidedKresh the Bloodbraided (who starts small but can scale absurdly in the right deck), and Coram, the Undertaker (who is on paper a little fiddly but is easy enough in the format to make gigantic)