If a player's Field Magic Card is Set when an active Field Magic Card is destroyed, the Set card does not automatically activate
That has some implications in burn and aggro decks, triggering prowess and damaging them, or simply rummaging a land away to get more gas
As you cast a few creatures and build up the creature tokens you receive for doing so, youll be able to deal damage to creatures or players and gain life, often making it difficult to do you any lasting harm
I don't think I would play the same variant that other players are using without their Extra Decks however
More importantly, though might be getting Enemy Controller from Kaiba as it's one of the most splash-able (can be put in a lot of decks) cards in the game and is always a useful quick-play spell
However, rabbits are powerless