No player may take any action in between the two steps of Fevered Visions's triggered ability, so if your opponent has four or more cards in hand after drawing a card, Fevered Visions will deal 2 damage to that player
What it offers is a way efficiently using what mana you do get, whether that be a two land screw or an eight land flood
Its also got great flavor text and art, so yeah
Anything more expensive than that was still firmly in the realm of unobtainable
Its also really easy to break, as all you need is two creatures that can flicker each other, which not only produces infinite +1/+1 counters on your creatures, but also scales firebending up to make infinite mana when Zuko attacks
For just one Psychic Energy card, Sableye gets access to its Lost Mine attack as long as the player has 10 or more cards in the Lost Zone