Before checking for lethal damage, the Seedling's controller would proliferate one time and could choose give the Seedling another +1/+1 counter
With huge pump effects (that aren't normally very good in Constructed) being twice as effective, Infect would allow for kills as early as turn two
Tinybones wants your opponents to put cards into their graveyards, and Waste Not gives you value when your opponents discard cards
Either way, you really need to capitalize on those +1/+1 counters, so I suggest you start with our articles on bolster, outlast, and adapt
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