Firebending Fire Lord Zuko shows us how fire can be used as energy, as it comes from the breath, not the muscle of direct damage or firebreathing
Collective Nightmare for smaller targets and Pile On for when you need anything dead
For a 60-card deck, you should play at least fifteen or sixteen lands that produce that color (seventeen or eighteen to be safe)
Snow mana is generic by nature, but effects that would reduce a spell or ability by a generic mana do not affect Snow mana
I make the exception for lands on this list because these have such an impact on Standard and took multiple sets to complete
I just think the card is well executed it being an artifact plays well with Urzas Saga, Improvise and Springleaf Drum, and unlike Thalia, Guardian of Thraben where youre locked out by the tax, you have the choice with Esper Sentinel which presents interesting in-game decisions as you have to balance the tax on the mana versus providing your opponent with card advantage a similar decision to that of being on the play or on the draw