At the beginning of your end step, if a player controls no creatures, sacrifice Sothera, then put a creature card exiled with it onto the battlefield under your control with two additional +1/+1 counters on it
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Even some of the full-art, borderless cards are available if you know what to look for, and weve got a handy list
Finally, when Slinza or any other creature with a power of four or more comes into play under your control, you can pay two mana to have Slinza fight another creature
It may have been a google image of a top 8 deck at a tournament
Some are easier to achieve than others, but they all require some level of precise deckbuilding to work