TOURNAMENT POLICIES Proof of Match Result : It is recommended that players take a screenshot of the victory screen for each game
If Explorer's Cache isn't on the battlefield as its activated ability resolves, you can't remove a +1/+1 counter from it, so you won't put a +1/+1 counter on the target creature
A card I considered but ultimately removed from this list was another Ral Zarek card, Blast of Genius
They are Vrondiss, Rage of Ancients (a Dragonborn Barbarian, leading the red/green Draconic Rage deck), Prosper, Tome-Bound (a Tiefling Warlock, helming the red/black Planar Portal deck), Sefris of the Hidden Ways (a Genasi Wizard, leading the White/Blue/Black Dungeons of Death deck), and, finally, Galea, Kindler of Hope (a Half-Elf Paladin, topping the White/Blue/Green Aura of Courage deck)
It is not an EX card, so you do not have to worry about your opponent gaining two points when it is defeated