They remain paired for as long as you control both of them.) As long as Thundering Mightmare is paired with another creature, each of those creatures has "Whenever an opponent casts a spell, put a +1/+1 counter on this creature." As long as Thundering Mightmare is paired with another creature, each of those creatures has "Whenever an opponent casts a spell, put a +1/+1 counter on this creature." Creature - Spirit Horse +1/+1 Generators (CTRL to add secondary) +1/+1 Interaction The Ozolith Whenever a creature you control leaves the battlefield, if it had counters on it, put those counters on The Ozolith
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You'll also note the artifacts that can help any tribe in here as well
So getting out two or three Merfolk out ahead of your commander is actually a good thing, because when he's out, instead of Exploring once, you can do it multiple times
Occasionally the Arena programmers will adjust these digital cards to power them down if they end up being too strong, or powering them up if they dont play as well as the designers hoped