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And it works well with flashback

Shambleshark has evolve and a starting toughness of 1, which should make it easy to stack counters onto it

When you buff your creatures, you want them to be able to get through the wall of fatties your opponents are putting up, and Flying is pretty good at that

If you mean 'challenging' other characters, or glimmers, in play Steel and Ruby are good at challenging and can get benefits for banishing opposing characters during challenges

Primordial Plasma would have been interesting and pretty usable, but it is locked behind six defense counters AND five mana to be worth the investment