Welcome back to the series that counts down all of the best cards in each two-color combo
These were gold-bordered (yellow in the modern format) and, at least in later expansions, would allow for more cross-colour identity in both gameplay and flavour
Moving it for only a single mana is really solid, and you really have something cooking if you can find a way to do this at instant speed
Seven mana's still a fortune for this sort of effect, but permanent creature exile on an ETB isn't something blue cards get to do often
So, if a player had a deck with Pandemonium and Saproling Burst for 21 damage to someones face and the Burst was killed post-combo, I can Aid it back into play (and smash someone for 21, such as perhaps the Pandemoniums owner!)
For example, if you give your Mother of Runes protection from red, it cant be dealt damage by Blasphemous Act, but damage from Bushwhack still takes it down, provided it comes from a non-red creature