The thing is, the creature isn't bolstering itself, it's just benefitting from its bolster ability
After much thinking, we chose morph, as it was the mechanic that was most about having two different states
For example, if you control The Ozolith ("Whenever a creature you control leaves the battlefield, if it had counters on it, put those counters on The Ozolith.") when Sin's last ability resolves, you'll put the appropriate number of each kind of counter onto both The Ozolith and the target creature
Sterling Grove is another uncommon that is valuable to vendors especially since the Daxos deck, though lacking green, could sway players to start creating enchantment based decks with green in them since Magics history is full of great green cards that support enchantments
Quina, Qu Gourmet While the ability may look a little silly at first, Quina, Qu Gourmet is a powerful engine in any token deck