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
You can't have more than 1 Radiant Pokemon in your deck
Wizards efforts to bolster whites weak points, namely in ramp and card draw, have done a lot of work to improve white commanders
Sufficient natural or even added artificial light/flash is encouraged so long as it does not intentionally or unintentionally obscure or hide damage on a card
Set Symbol: Every card belongs to a specific set, indicated by a small symbol or set code (e.g., a Two overlapping stars for Neo Genesis, PFL for Phantasmal Flames)
What gives the edge to Offer over Swan Song for me is the ability to counter your own spell for two treasures