This keyword has caused Treasure Cruise and Dig Through Time to be banned in Modern and Legacy while being Restricted in Vintage thanks to the presence of Fetch Lands absolutely breaking them
These are strong build-around-me Fogs give you a high chance of having most or all of your stuff not prevented but your foes' only a small number if any, having their damage allowed
That is, if Gigantoplasm is a copy of a creature with base power and toughness 2/2 and you activate its ability making it a 4/4 creature, another creature that becomes a copy of Gigantoplasm will have base power and toughness 2/2
Obviously, this is a case where the Adventure isnt always going to get cast before the creature, but its nice having that late game ability to see a bunch of cards Lagoon Breach is removal, even if it is situational, and then the whale is certainly beefy enough to trade for something, so were talking about a 2-for-1 here
Now I should just try to power my way through the Arena novel