...Dragons
In designing this Wizard's Tower, I have been thinking a lot about the 1995 book Merlin and the Dragons by Jane Yolen, with illustrations by Li Ming. We had a copy of the book when I was a kid and, more importantly, a cassette tape of it--a favorite on the drive to school. The narrator of the tape had this wonderful way of saying the line "My tower will stand" and my dad used to do a pretty good impression of the voice of some wicked usurper fixated on building a tower to make a final stand. The whole thing with that story is that the tower will not stand because there are two dragon eggs beneath the ground and the breathing of the dragons in their eggs causes the tower to collapse.
All this to say, I like this connection in my mind between towers and wizards and dragons--and also the mid-90s?--so, there is something fitting about having the top-end bombs of this project being dragons.
I did not even have a chance to test Rogue Elephant but the lack of literal forests make me concerned it could/would be a dead card. Chainer's Edict is just a solid card with the added bonus of flashback tension whereas Phyrexian Boon felt more like a cute trick.