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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

The same is true for any counters that change its power and/or toughness and effects that switch power and toughness

You cant fetch Daxos, Blessed by the Sun with The World Tree, for example

Im not a big fan of putting all my eggs in one basket, so I enjoy decks that encourage you to use Equipment while also building up a board presence