Signaling is the process by which drafters often communicate to other drafters (silently, because talking during the draft is not allowed in sanctioned events) according to which cards and colors they are passing and which colors they are not
Before we get started, though, Ill quickly go over the concept of card advantage for those unfamiliar
Ceruledge Illustration Rare Just like you cant judge a book by its cover, you can always judge a Pokemon card by its rarity alone
Feather, the Redeemed It's obvious
Theyre plenty good if you only use them to get two of the three colors they fix for, and some decks (notably those with Landfall and Sacrifice triggers) will use them even if they only hit one of their colors
Searchable PDFs of the 5e handbook are just a Google search away, and building character sheets in D&D Beyond will tell players everything they need to know when casting a spell