1999 pokemon cards Base Set Rare Computer Search #71 [Lightly Played] [LLL] Electric Shock (50) Flip a coin The Most Valuable Base Set

[C][C] Tackle: 20 damage

This card doesnt necessarily warp formats or break the game, but it has that sort of all-around versatility that makes it such a staple in many formats

Later releases tempered Claydol's abilities, and it never regained the same importance as those earlier years

Pattern of Rebirth Pattern of Rebirth is one of the best ways to tutor creatures straight to the field, and doubly so in a deck with lots of free sacrifice outlets

As it will need instant speed removal to deal with it so you don't get the Flashback value

It is also one of the only cards like this that doesn't cost mana to access the second potion