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Use the mana value of the legendary creature that died as it last existed on the battlefield to determine what may be targeted with Havi's last ability

Some examples of this would be Vengevine, Vorapede, Lotus Cobra, Rampaging Baloths, Thragtusk, and Questing Beast

Then, shuffle those Energy cards back into your deck

Because of where the influence for Sliv-Mizzet comes from, I believe its more functional than most silver bordered cards, but not by much

Her triggered ability makes a legendary Dog token, but luckily, you get to choose a name for each token - that way, you get to control multiple legendary Dog tokens since they'll all have different names (and will let her attack trigger work better)

Special Summon 1 Fiend monster from your hand or GY, then you can destroy 1 card you control