If you cast such a spell without kicking the spell, you can ignore those targets
People use proxies for testing new decks, to add spells that cost a real fortune to a certain deck, or even for safety reasons you dont want to have your expensive and unique cardboard stolen
While I feel Tag Teams were a huge misstep towards balancing the game, Sword and Shield provides a new diving-board between Pokmon- V and the V-Max mechanic to rejuvenate the game and get back to a period where all styles of decks are viable, and not just the big, beefy 270HP Basic Pokmon
As well as the 25 reprints, Celebrations includes 25 brand new cards (are you sensing a theme here?), some of which combine gameplay mechanics from older sets with more recent additions to the Pokdex
This is a bit like asking whether tires or an engine is more important for your car
P/T Number 34 Language English Legal Formats Commander, Legacy, Modern, Vintage Not Legal Formats Alchemy, Brawl, Competitive Brawl, Historic, Pauper, Pioneer, Standard, Timeless Rulings (8/7/2020) If a card in a player's library has in its mana cost, X is considered to be 0.
