ultra necrozma pokemon card VMAX Metal Gold (You cant use more than 1 GX attack in a game.) Dusk Mane Necrozma - Ultra

Sometimes though, you are absolutely flush with cards and you'd much rather use it as interaction, regardless of how it affects card economy

For instants and sorceries, that happens when the spell resolves

You can use it for its intended purpose of copying a spell, or run it alongside free spells like Fury and Force of Will to guarantee you have the right card to pitch every game

If you won five flips this way, you may cast spells from your hand this turn without paying their mana costs

Krarks ability lets you copy instants and sorceries, and Sakashima removes the legend rule while becoming a copy of Krark

Those formats are my babies right there