When Richard Garfield developed Magic in the early 1990s, there was no precedent for balance
Topps Pokmon Series 1 Light Play - Excellent
Azors Gateway / Sanctum of the Sun I recall people losing their minds over Sanctum of the Sun when it was revealed, but as appealing as it is to tap a single land for 30-40 mana, its actually appropriately gated behind the Azor's Gateway mini-game
The older version of this card, from the Ravnica block MTG set, Dissension, has spiked in price by 476%, rising from just $1.70 to $9.80 in the course of about a month
If this is the only card in your Spell & Trap Zone: Target 1 "Timelord" monster in your GY
Liger Dancer also has the ability to (quick effect) destroy all your opponent's special summoned monsters by sending a Lunalight monster from your extra deck to the GY