Like most Pokmon cards, the value of Togekiss depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (HSUndaunted)
The Best Pokmon Sword & Shield Cards to Transform Your Deck on Any Budget The Pokmon Trading Card Games' latest set, Sword & Shield, has cards to augment your deck at any price point
The game cannot proceed because of this, unless something kills the clone (such as someone casting a Lightning Bolt on it.) The proper result of this would be that the game ends in a draw.
If you do spot a particularly gnarly card, check the MTG Commander banlist just to make sure it isn't so good that it's illegal
Use cards like Dolmen Gate to get safe damage in and make tons of elves
You can afford to have the odd card, or far end of your range, under catered for