If the keyword has a modifier, such as a mana cost or a number, you must choose a modifier that's been printed
Thats right: all other characters
Whispers of the Muse (T1, Ext, S, Block) A favorite in "Turbo Xerox" (a blue deck which used minimal land but a ton of cantrips to thin out the deck), Counter-Phoenix (Shard Phoenix + Forbid) and Tradewind-Awakening (put Awakening on the stack, tap all your lands for mana, untap all your lands), Whispers has what might seem like a hefty price to pay for one card but you get to do it turn after turn after turn
Fae-Cursed King remains a menace in commander and was a finisher in many constructed Food and sacrifice decks
The passive ability is the real draw on March of the Machine planeswalker, Chandra, Hope's Beacon, allowing you to copy spells while the loyalty abilities play board control