While Wild Mongrel might be the primary engine for dropping an early Wurm, the best opening play possible for this deck would be first turn Careful Study, dropping two Basking Rootwallas into play
Deathbloom Thallid
And the card specifically needs sagas, meaning any generically powerful saga cards are in
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Both of these can also be considered a top 10 card for collectors, also demanding a rather mighty price at around $72.13 for the former, and $232.71 for the later in the market right now
The Abzan, Mardu, and Sultai aren't evil, but they're fiercly protective of their own, and are ready to do anything it takes to look after themselves