If the target creature is an illegal target as Oracle's Restoration tries to resolve, it won't resolve and none of its effects will happen
When hunting tokens, etc., you can corner your opponent in a good way if you have this
I'd like to interject a note about sportsmanship here, in my opinion, if someone is going to win, and you use a pact to stop them with no chance to pay for it on your next turn, that's not really "competitive play"
In the Deneb example, Denebs effect is activating on the field, so you cannot chain Debunk to it
Meowstic Constraint Pokmon Evolution Line Meowstic Source: official-artwork Source: official-artwork Source: official-artwork Source: official-artwork Source: official-artwork Genera Constraint Pokmon Evolution Line Meowstic Meowstic 037/083 Ninja Spinner Meowstic 033/080 Nihil Zero Meowstic 332/742 Start Deck 100 Battle Collection Meowstic 054/106 Electric Breaker Meowstic 042/068 Incandescent Arcana Meowstic 042/068 Incandescent Arcana Meowstic 190/414 Start Deck 100 Meowstic 026/070 Single Strike Master Meowstic 060/173 Tag Team GX All Stars Meowstic 041/095 Double Blaze Meowstic 049/131 Starter Deck GX Meowstic 031/094 Forbidden Light Meowstic 025/051 Light-Devouring Darkness Meowstic 017/032 Pokkyun Collection Meowstic-EX 196/XY-P XY Promos Meowstic 008/022 Tournament Starter Set 30 Emboar EX vs Togekiss EX Meowstic 041/XY-P XY Promos Meowstic 038/080 Wild Blaze

However, the second ability veers us off in another direction entirely, encourging us to attack with both Estinien and Dragons, the latter of which is not very represented in this particular deck