Its effect to pay the top card of your library is easy to accomplish and can be done at instant speed, so even if you have removal for Urza, the effect can be used multiple times before it ever resolves
While ten might seem like a lot, it really isnt especially with cards like Jeskas Will, Smothering Tithe and Dockside Extortionist running around
Sure, your other cards are safe, everything ranging from your creatures to your lands, but Sigarda puts a huge target on her back when you do so since she doesnt naturally have any protection
English prices will be volatile in launch week and typically settle lower within a few weeks, so check recent sold listings before buying or selling
But, best of all, its completely free to use
Secondly, you can return another Fluffal monster to your hand to special summon any Edge-Imp monster from your hand or graveyard, ensuring that youll definitely have a Fluffal and an Edge Imp on the field, ready to fusion