Theross Mono-Color Gods Heliod, God of the Sun Nylea, God of the Hunt Purphoros, God of the Forge Erebos, God of the Dead Thassa, God of the Sea Think of a Standard format utterly dominated by mono-color decks for about a year, and these cards are the main culprits
Some of these are problematic with the fundamentals of the format, like Karakass ability to shut off any commander at virtually no cost, or the way Trade Secrets lets you collude with an opponent to each virtually draw your deck
Active format specified for each event (Constructed, Sealed, or other formats specified by the organizers)
Even with that restriction, drawing three is phenomenal, as it helps to thin the deck of bad draws, something Boros decks are keen to do given their overall less powerful draw power
Rarity: The Foundation of Value Rarity is the single most important factor when determining the worth of valuable Pokmon cards
Cards stacked too closely together can become damaged over time, and the same goes for loose piles of cards