Its currently playable only in the Traditional TCG format, and thats only because no cards are actually banned there
When it is played, Professor Sada's Vitality allows players to attach an Energy card from their discard pile to up to two of their Ancient Pokmon and then draw three cards
However, the card is still a massive powerhouse for Trap decks, which focus on interacting and Special Summoning on your opponents turn
It was rare that a deck built around ritual summoning would successfully reach the upper echelons of the competitive game, but this deck did so by draining your opponent of resources during a mammoth opening gamut that, without the right hand traps to counter your opponent at the right time, could (very) slowly deck your opponent out before they had a chance to play
Its Level is 9, which is relatively high, but it can bounce an opponent's monster and itself back to its owner's hands, thus fulfilling this card's condition right away
If you chose Jeskai and creatures you control deal combat damage to multiple players at the same time, Frostcliff Siege's ability will trigger once for each player dealt combat damage this way