For more on the best deck size, interesting large deck cards, and an intro to formats and card sideboards too, read on
Its also really easy to break, as all you need is two creatures that can flicker each other, which not only produces infinite +1/+1 counters on your creatures, but also scales firebending up to make infinite mana when Zuko attacks
Artifact Tokens (CTRL to add secondary) Tutor Tutor (CTRL to add secondary) Untap Untap (CTRL to add secondary) Maybeboard Uthros Research Craft Station (Tap another creature you control: Put charge counters equal to its power on this Spacecraft
If you want to know which is better, check out my rankings of the swords
Cards that retarget things might not always be what you need at the moment, but when they are, they tend to create epic moments
Non-red decks have plenty of answers too