I explore how the mechanic works, how it plays out, and some of the best cards to ever feature the mechanic
For example, if Clive's Hideaway's hideaway ability is copied and two cards are exiled, you may cast both exiled cards without paying their mana costs (assuming you control four or more legendary creatures at that time.) Gogo's ability can copy any activated or triggered ability on the stack, not just one with targets
Introductions ensue, first the Sun Empire, then the River Heralds
For example, see this card
10 Most Expensive Brilliant Stars Chase Cards Its been a while since the meta bending Brilliant Stars pack was released
Nesting Dragon 3RR Creature Dragon 5/4 Flying Landfall Whenever a land enters the battlefield under your control, create a 0/2 red Dragon Egg creature token with defender and "When this creature dies, create a 2/2 red Dragon creature token with flying and 'R: This creature gets +1/+0 until end of turn.'" Because Nesting Dragon's landfall ability doesn't assign a name to the tokens, the tokens are named by their given creature types: "Dragon Egg." This means that the creatures have the same name as the creature card Dragon Egg, although the tokens have no mana cost and their converted mana cost is 0