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i do love the idea of undying + Zameck Guildmage .
Other ideas:Deadly Recluse - not good at evolving your creatures, but has decent synergy with pit fight. If you can put it into the battlefield with extra counters you can rancor him for that great deathtouch/trample effect. Very underrated card in general.
and Silklash Spider - will evolve your creatures with its 7 toughness. the two green doesn't seem too bad by turn 5 either. excellent against a token fliers deck.
i would say silklash is the least playable due to its high cost. The fog bank does not seem to fit too well either.