You dont need to pay additional mana, but the tradeoff is that the effect only triggers once per turn
Elsa Spirit of Winter utilizes the highly effective Shift mechanic, which allows players to pay a discounted cost to place her directly on top of a smaller, pre-existing Elsa card to activate her abilities much earlier in the game
Paying three energy for a 5/5 copy of a good artifact, even if it only lasts until the end step, is such as strong move
Darksteel is an old set, so near-mint foils are getting pretty hard to find, especially since there were so few foil copies printed in the first place
With a game that is nearly 30-years-old, Magic: The Gathering is an expansive tabletop strategy card game rich in lore and playing formats
Rip only gets better the more power they have, so keep pumping them up with all sorts of enchantments and equipment and you'll be digging through huge chunks of your deck every turn