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If there's a cost associated with having it attack, you aren't forced to pay that cost, so it doesn't have to attack in that case either

Runic Armasaur : This nasty dinosaur only costs 4 mana, but at 4/5 with a draw for each time it takes damage ability, it comes out early in a green deck and an snag you quite a few cards

Think of Phyrexian Arena

When you only have one copy of a card in a deck, it has fewer chances of appearing, and when the deck has 100 cards, the odds are even smaller

Cards that prevent opponents from putting counters on other players like Vorinclex, Monstrous Raider can prevent poison counters

it only takes three constellation triggers to give Anikthea 32 power, one of which is achieved with it attacking, so you can take an opponent out from nowhere or just turn all your 3/3 menace creatures into far more formidable 6/6 menace creatures