Originally Posted by
Echelon
The charm is an instant, which means they can kill your creatures as a response to you casting it (as can any spotremoval). In this case you rather just feed your creature to NO for Progenitus and laugh at the charm rather then try to Pattern your creature.
The Deluge is a sorcery, so you don't have that problem there. But again - the decks playing that card will have spotremoval. If you want to keep something after a sweeper, go for the Packmaster.
Also, it doesn't help us one bit against Terminus where the Packmaster does.