To illustrate this point, lets take a look at a lands and spells hand from Modern Deaths Shadow: While this hand may look like a fine keep, I believe it to be a mulligan
Imperm, Songs, Purge on your Arianna or much of the same + Impulse on your Ariane will trigger Lady and still let you get what you need anyway, creating a losing trade for the opponent
So it's best to keep them out of reach
C Common Black-Winged Dragon X DARK Level 8 [ DragonSynchroEffect ] ATK 2800 DEF 1600 1 Tuner + 1+ non-Tuner monsters If you would take damage from a card effect, place 1 Black Feather Counter on this card instead
Not surprisingly, the original Mythical Pokmon made an appearance as part of this setand not only that
in that it's discarded, it's able to Special Summon a Danger