Tap your Priest of Titania, add 10 mana or so, and give all your elf creatures +6/+6 until end of turn
This is represented on his card by the Enrage mechanic, which triggers every time he takes damage
The single most important card in the game for me was probably Three Tree City, in that my pivotal turns in the late game were made possible by the extra mana I got from that amazing land
As a colorless creature, it fits all EDH decks, so thats another positive aspect of the Cicada
Granted, there are practically zero penalties for losing, so theres no reason not to just concede and hope for better luck next time, but that random element seems to end most games before they can even start
Powder Keg has a very quirky feature: The tighter your deck is, the less you want to see your opponent play Powder Keg