This will also turn your dorks into an Ancient Greenwarden and play lands from your graveyard, Carnage Tyrant to make it a beater, Grunn, the Lonely King to double its power when it swings alone, Kamahl, Fist of Krosa to Overrun and make lands dorks, Multani, Maro-Sorcerer to grow massively in size and get shroud, Nemata, Grove Guardian to make a bunch of tokens, Primordial Sage and Soul of the Harvest to draw cards, Rampaging Baloths to landfall and game win, and that's just one casting cost
I don't understand why it names itself since when you cast a second copy, one of them will have to be destroyed
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This feels more like duck hunting, but however you look at it, you'll want to give Haldan some evasion and possibly use a tool like Strionic Resonator to double his triggers
The other huge upgrade that isn't a Vampire is, of course, Skullclamp, which if you're lucky enough to find / stick on the battlefield will draw you all the cards you need to close out the game
Though maybe a touch too much mana for an aggressive white deck to muster in Standard, Halvar can do a lot of work in Commander in equipment decks