You can really load up with small stuff in Simic like Birds of Paradise or Llanowar Elves rather than Rampant Growth or Arcane Signet
Lets just say, for arguments sake, you end up playing two mana rocks, an artifact creature, and make 1-2 treasure tokens before attacking with this
And then you make a 4/4 flyer that's swinging for the turn as well, and if it this, that's eight damage to them plus the four, for a grand total of twelve life differential on the fourth turn after casting it on turn three
Fire/Ice is also not as restrictive as the non-hybrid mana gold cards as you can still put it to use while missing a colour
In our opinion, the Sapphire/Steel starter deck is the better of the two for a few reasons
Heliod, Sun-Crowned Heliod, Sun-Crowned is powerful because its very flexible: It's among the best mono-white commanders in the game, but it's also a role-player in any given deck