On their own the two just offer infinite creature untaps and combat phases, but if you sprinkle in a pinger here, an attack trigger there, or a mana dork, any one of those going infinite is enough to finish a game
It has a bonus effect that if a Dark Spellcaster Monster battles, Apprentice Illusion Magician can send itself to the Graveyard and give that Monster 2000 Attack and Defense during the Damage Calculation of that battle
If nothing else, its controversial as well as powerful and has only gotten more popular since it was first printed
A Starter Deck is perhaps the easiest way to get introduced to a trading card game, as it provides players with a full list of cards with pre-built synergies to learn and master
For legendary creatures Ill still assign one letter grade, but also talk about the cards viability as a commander or in the 99