Anyway, Amulet of Safekeeping is probably good enough to see at least marginal Modern and even Legacy sideboard play
Anything that costs more mana will put a strain on your available mana in any given turn, no matter how much "bigger" the effect is
People wanting to talk about that ability tend to use the card name as a shorthand for the effect as it's the most obvious thing that connects to it
(Of course, your opponents can also respond to try and stop you, but interaction is fun.) You may choose any creature you control, including one that doesn't have toxic, if you don't want to draw cards
Cheshire Cat, From the Shadows has the potential to clear out an opponent in the right circumstances.
Auctioneers, or wire transfer