dog deck mtg commander EDH Deck Rin and Seri, Inseparable 100 Magic Cards Custom Deck Cats Dogs Kindred Changelings You may play that card this turn 5 Best Tribal Dog Commanders

It's kind of the best of both worlds

Tolkien wrote, the journey doesn't end here

This ability lets Massacre Girl and all your other creatures deal combat damage to other creatures in the form of -1/-1 counters, perpetually weakening them

If a permanent enters the battlefield as a copy of Corrupted Shapeshifter, there will be two copy effects to apply to it

Once the starting hands have been kept and the Planechase game is about to begin, the starting player reveals the top card of their (or the shared) planar deck and its abilities are in effect

The flexibility makes up for that some, but for this to really feel good you need to be casting something from your hand for free