Getting energy equal to the mana you spend on spells should net you around eight to 10 a turn, which, combined with your other energy generators, will let you activate that second ability reasonably quickly
I think Greasefang is probably the archetype that improved the most with the new set, as these cards really fit well into the shell
There are also some number of quality utility lands that involve sacrificing that make this card even better: favorite Mirrorpool springs to mind, but theres also Buried Ruin, Command Beacon, Inventors Fair, Urzas Saga, and if youre a degenerate Strip Mine
Whenever you gain life, one of your opponents loses that much
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The sleek design is visually appealing and professional, making your deck stand out in both casual and competitive settings