mtg cards like curiosity Surveilling Sprite - Ravnica Flash Whenever a creature you control deals combat damage to a player Curiosity | Wilds of Eldraine

Multi-colored cards , as the name suggests, often overlap with two colors (a vampire cleric would be a good white/black card for example) and requires both color land to play the card

6 Bitterblossom Dreams Bitterblossom dreams is the fourth Secret Lair ever dropped, featuring four Faerie tokens as well as a full-art remake of the well-respected enchantment Bitterblossom

Since all Modern cards should pass through Standard at a given point, WotC was having trouble feeding the format with new cards or reprints, since cards like Tarmogoyf and Cryptic Command would be too powerful for Standard (were talking about the 2013 MTG era, keep in mind)

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Again, both cards need to be in play