This increases both its overall damage and the chance to successfully flip that coin
Youre not always gonna want to tap your creatures to make mana, as that can be a very real cost, but at least this can also produce colorless mana normally, it has useful typing as both an artifact and a clue, and you can of course throw it away for a card
In metagames rife with Reliquary Towers and full grips, this is going to be obscenely good (because it'll be like a 30/30, and it will tutor for that Strip Mine, Dust Bowl, and/or Wasteland to destroy the Towers)
The former was done in both Lord of the Rings and Doctor Who, and there are more than enough iconic villains and monsters in the series to carry its own 100 cards
He'll let you prevent all damage that would be dealt to a target creature with a +1/+1 counter on it, useful if you've already got Kyler handing out counters like there's no tomorrow