The War Doctor tracks each individual card that gets exiled or phased out, so effects like cascade can quickly rack up counters on The War Doctor, potentially even enough to take out an opponent in just one attack
Looking for a hydra to build around, or some good beefy creatures to include in your decks
Flesh Duplicate is a clone effect from the MTG Doctor Who set
The biggest reason for these changes, according to Rosewater, was the intention to create a better play pattern for the token type
In this case, if damage would be dealt to a creature the turn Gatta and Luzzu entered play, G&L will replace that damage and put +1/+1 counters on the creature instead
Both vintage and modern Pokemon cards follow this system, so the age of your cards wont play a role here