In the right multicolor deck, Raffines Tower is undeniably a good inclusion in the 99
Well, its a powerhouse in Esper Raffine in Standard right now, but Ao is seeing a lot of play in Commander, too
This is two mana less than half the time and so has dubious eligibility for this list
In a standard game, you want to warp it on turn four, play your land for the turn, perhaps have a one-mana play to make and then swing with a pumped-up creature
It can goad creatures when it attacks, so attacking an opponent with no threats to it is wise, and you can goad a creature that is a threat to you
Its good at all stages of the game but imagine cheating one of these on turn 1 or 2