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The most common way is the suspend mechanic, like on Search for Tomorrow or Sol Talisman, which lets you exile a card from your hand, put some time counters on it, and then cast the card for free when those counters are gone
When Chandra's Firemaw enters the battlefield, you may search your library and/or graveyard for a card named Chandra, Flame's Catalyst, reveal it, and put it into your hand
There might be situations when you cant attack to get the win
What decks are you playing in Standard right now