Until end of combat, you don't lose this mana as steps end." Mana from firebending abilities isn't lost until you leave combat and go to your second main phase
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First strike makes the creature harder to block, allowing it to reach renown, and then makes the upgrade more valuable because first strike's value is closely tied to the creature's power
For 1 mana, its a 1/1 creature that gains a spore counter during your upkeep, and with three counters, you can create a 1/1 green Saproling token
You can also include Rhystic Study in that list too
Whenever you cast a colorless spell, until end of turn, Skittering Cicada gains trample and gets +X/+X, where X is that spell's mana value