Not only is this effective at mitigating any battle damage you might have taken from combat (though that's also hard since Ni-Ni takes no battle damage and reflects damage back), but it blocks any combos your opponent might have been planning with their monster for their turn
You can only use this effect of "Chaos Daedalus" once per turn
Yes, these must be textured foil double exposure cards
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Primarily both are played as a two drop that draws a card, the elf is just a body to be done away with via Skullclamps etc or offer up synergy for better elves where as the wall is more of a speedbump against aggressive decks
Now You See Them, Now You Dont For several of the cards, the Ring tempts you is an enters-the-battlefield trigger, so Id start pulling aside various cards that can help you leverage that further