The one other solution to this problem was to leave some individual tribal cards (most of the creatures associated with a realm above have at least one card that mechanically cares about it) and add changeling to the set
It gives some presence in the sky, it has some removal and reach built in and has potential cool interactions with other cube cards coming through the roof
The playtest name for Erratic Explosion, since we seem to be on the topic, was Gottlieb's Bolt
I write regular stuff over at StarCityGames.com, so if you want to see more material from me, check out that site or stop by the Tournaments page for every Pro Tour, where I am part of the event coverage team
First, we will talk about what makes a good anti-Burn card
Protection Stops DEBT A useful acronym for thinking about what protection works against is DEBT