If you can put it into play on Turn 3-4 with Monster Manual, it can easily start picking off your opponents with infect damage
Whats wild about Icetill Explorer, however, is that theres a pretty good argument for just running it in any green deck
Evolved Spinoderm has trample as long as it has two or fewer oil counters on it
On top of that, the fact that its a colorless creature means that you get to play this artifact creature in pretty much every deck
With the removal of Rule 4 in Commander last year, which restricted the color or colors of mana you could produce to your commanders color identity, Praetor's Grasp got better because youre no longer forced to find cards in your colors if you want to cast it later
For example, if an opponent loses 1 life and then gains 2 life in the same turn, you can cast a spell for its spectacle cost that turn