Jace, The Mind Sculptor Oko is far too banned to clinch the top spot, so the prize instead goes to the ever-popular Jace, The Mind Sculptor , arguably the best MTG planeswalker ever printed
"A Charizard was the rarest holographic in base set, so pulling one from a pack was like winning a mini-lottery
You can choose several cards for your deck and get a lot of useful effects like: Summon of strong monsters
It's 5 mana, which is even more expensive than an already expensive 4 cost enchantment with several variants, but it's a 4/4 on it's own, drops a +1/+1 somewhere (probably on itself by default) and then will give you draw
If the Pokemon depicted in the scene that plays when you pull this card knew how...not deadly since they only faint, but how dangerous this Pikachu was, they'd probably give them more space or run
Sandbagging an answer or a threat is a viable tactic, but if someone is surprised when you win after holding back, they were not assessing threats during the game