Oh, yeah. Actually, the best strategy is to take Tap, immediately buy boosters for all the snowballs to raise the Loot rating, defeat five more opponents to get the remaining sources of resources, buy a boost again or wait a day. Raise all the characteristics and repeat the process 4 times :)
As for the best set of things... My best result is a set of crits. A few Chill for the crits. Multiple Targets to boost the crits for each attack. Several Coffees for the heal by crites. Pebbles for stun by crit. A few Shields to protect and something to attack. And if you collect all this, you can beat two more opponents! :D What will give us, in the end, a dozen fertilizers :)