Keldeo ex's first attack is extremely underpowered, as it only deals 120 damage at best, and it requires it to be switched into the Active Spot to deal maximum damage
When the children were grown, he finally allowed the Valkyries to take him
Simply put, the best way to deal with a threat in Magic is to remove it before it's a threat, and Counterspell rips spells right out of the stack and into the graveyard
Green Always Play: Bala Ged Recovery, Tangled Florahedron, Turntimber Symbiosis, Khalni Ambush, Kazandu Mammoth
You're trading Frodo's weakness to instant death for Boromir's lingering weakness to repeated skirmishes, and swarm decks or cards like Bill Ferny, Swarthy Sneering Fellow (2R75) or lair Nerta, Dark Horseman (19P38) can often keep pushing him into skirmishes