Tapping Mirri after creatures have attacked will not remove creatures from combat
You may put that card on the bottom.) Land Land (CTRL to add secondary) Protection Bronzehide Lion : This creature gains indestructible until end of turn

Abduction Absolver Thrull Abyssal Gatekeeper Academy Rector Adarkar Valkyrie Aerie Ouphes Aetherworks Marvel Agent of the Iron Throne Agyrem Akki Blizzard-Herder Akki Raider Algae Gharial Ancestor's Embrace Anodet Lurker Antler Skulkin Aphetto Vulture Arcbound Bruiser Arcbound Crusher Arcbound Fiend Arcbound Hybrid Arcbound Lancer Arcbound Overseer Arcbound Ravager Arcbound Reclaimer Arcbound Slith Arcbound Stinger Arcbound Wanderer Arcbound Worker Archive Haunt Archon of Justice Arctic Nishoba Ashen Reaper Ashen-Skin Zubera Ashiok's Reaper Aspect of Mongoose Audacity Aura Thief Aven Fisher Axelrod Gunnarson Banewasp Affliction Bant Sojourners Baron Sengir Belfry Spirit Benediction of Moons Benevolent Geist Bereavement Bitter Chill Bitter Ordeal Black Market Blade of the Bloodchief Blightsteel Colossus Blind Hunter Blistergrub Blood Cultist Blowfly Infestation Body Snatcher Body of Jukai Bogardan Firefiend Boggart Shenanigans Brilliant Halo Brinebound Gift Brutal Expulsion Builder's Bane Burning Sands Burning-Eye Zubera Burr Grafter Bushi Tenderfoot Butcher of Malakir Bsium Strip Carbonize Carrion Thrash

Right now I only have one copy, but ultimately I think you would be better off with two Sylveon, one Espeon
The card is from the Exodus expansion packwhich was created in 1998and was the first foil card that Wizards of the Coast ever made
Example supporting cards: Harrow, Explosive Vegetation, Explore, Cultivate, and Farhaven Elf