There's the vanishing mechanic, usually found on enchantments like Out of Time or creatures like Dreamtide Whale, which forces you to sacrifice that permanent when it runs out of time counters
Honored Hierarch wont do anything unless you can get in an opportunistic attack
This pan-flute paragon makes a 2/2 the first time you cast an enchantment every turn, and better yet, the 2/2 he makes is also an enchantment, so it effectively doubles your first Constellation trigger
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To double-dip on his ability, we've though that either Narrow Escape or Kor Skyfisher will do nicely for a rinse and repeat effect to multiply those level counters (too bad Gilder Bairn isn't in standard anymore)