Imprint, for instance, started out in Mirrodin by only having cards that were imprinted when they were first played
The whole point is to turn their own cards against them and mess up their strategy, so getting to look at (and memorize) the opponent's hand, discard something from it, and then using another quick effect card to re-equip the Relinquished/Eyes Restrict with something else is effective
If you have any questions I will try and help when I can.
Crow can throw a wrench into their plans, especially since it hits both Monster and Spell and Trap cards
This gives you an opening to use Baba Lysaga to sacrifice that saga along with a few other permanents to refill your hand and lifedrain your opponents, and you still get the sagas chapter ability when it resolves
If this spell's additional cost was paid, this effect doesn't affect combat damage that would be dealt by red creatures