And just in case, since protection is a tricky keyword: The bonuses that Sword of Fire and Ice provide do have synergy protection from a color not only protects against removal, but also lets you bypass blockers from that color
Remember, drawing cards should not be done mindlessly
But while the windows of action granted to players across a turn are very generous, they are not all-encompassing
Spells with split second only prevent new spells and activated abilities from going on the stack until those spells resolve, but once the spell with split second resolves, you're free to interact normally with any other spells on the stack
Otherwise, step on the gas, stop their life gain and go for the win because 4 damage is a lot and the loss can sneak up on players that are not keen on calculating your pump spells and burn
The Godzilla cards look fantastic and look even better in a card sleeve and on the battlefield