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If some, but not all, of the creatures are illegal targets as the triggered ability tries to resolve, the original distribution of counters still applies and the counters that would have been put on illegal targets are lost
Since you can make a copy at instant speed, you can ramp by copying a Sol Ring or an Arcane Signet to have enough mana for an instant spell that can counter an opponents spell or destruction spell targeting a creature
Brawl Not Legal Vintage Legal Timeless Not Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Legal Barad-dr Legendary Land Barad-dr enters tapped unless you control a legendary creature
Enchantment Color tag templates(None) Teleportation Circle At the beginning of your end step, exile up to one target artifact or creature you control, then return that card to the battlefield under its owner's control
Nesting Grounds and Interplanar Beacon provide loyalty counter manipulation and planeswalker protection