The most commonly held argument is that of Promissory Estoppel, which, in massively reductive terms, says a promise can be legally binding, even if there was originally no legal declaration or intent
Both give you a complete, ready-to-play experience
Generic tribal cards like Chronicle of Victory, Heraldic Banner, Patchwork Banner, and so on are all perfectly reasonable additions to any tribal decks
Cloak Because Morph was considered to be a bit weak for the Standard environment at the time of Murders at Karlov Manor and hence produced disguise, that set also introduced an upgraded coordinate mechanic called Cloak
Item Number (MPN): 10374
The Discover ability in MTG is allowing players to double up on their casting value and build impressive boards, and well show you how it works