While I'd like the game to be as accessible as possible, even on a tournament level, you shouldn't be able to build a $2,000 deck with fake cards and then expect Wizards to offer you prize money for playing its game
Richard Garfield, creator of Magic: The Gathering, has the card printed to celebrate his wedding to Koni Kim and send it out among the wedding invites
While its more expensive than Panharmonicon , the addition of an instant spell that can copy your activated or triggered abilities is quite nice and I think it helps justify the increased cost
Ward 2 also offers a modest bit of protection, forcing other players to spend two mana just to cast a spell on any creatures affected by Yunas ability
If it's something you can spend mana on, it's a cost
But they have sideboard cards, too