If the enchanted creature has any subtypes other than creature types, such as Equipment, Vehicle, or Urza's, it loses those as well
Each spell with tiered has a base cost as well as multiple modes, each with their own additional costs
Original fearsome Dinosaur commander Gishath, Suns Avatar makes a great default choice, hitting the battlefield with haste and quite likely crashing through and finding even more Dinosaurs
So if you can give a creature unblockable, or go wide enough, there isn't much your opponent will be able to do
The only commander deck missing from Amazon's pre-order options at the time of typing this is the one themed after Final Fantasy 7 with Cloud leading the charge
And, depending on your other cards, he can be questing quietly while your opponent pays attention to something more threatening