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You can play Norman Osborn early, build up some counters with connive, then transform it into a beefy, evasive Green Goblin
Sadly, there isn't a perfect answer to this question
It's legal to cast such a spell with no targets, although this is rarely a good idea
As Agadeem, the Undercrypt enters the battlefield, you may pay 3 life
Brawl Legal Vintage Legal Timeless Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Legal Toolbox Notes and Rules Information for Rivendell: The legendary creature must already be on the battlefield as the land enters the battlefield