Distortion Strike doesn’t grant an ability to the targeted creature. Rather, it affects the game rules and states something that’s now true about that creature. The creature can’t be blocked even if it loses all abilities.
Distortion Strike
At the beginning of your upkeep, all delayed triggered abilities created by rebound effects trigger. You may handle them in any order. If you want to cast a card this way, you do so as part of the resolution of its delayed triggered ability. Timing restrictions based on the card’s type (if it’s a sorcery) are ignored. Other restrictions are not (such as the one from Rule of Law).
Rebound will have no effect on copies of spells because you don’t cast them from your hand.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Goran Josic
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
