The design was probably intended to fight decks that draw many cards, but it quickly became a meta-warping card thats often in ban-worthy discussions
As I explained above, green really relies on creatures to draw cards
Thragtusk is a necessary evil, but Jace and Tamiyo are often similarly threatening and Jace costs less mana
The fact that it gains the basic land type you choose is massive, too, since it turns on synergies with cards like Utopia Sprawl, Verges, Checklands, etc
Taking a quick detour into the Final Fantasy Commander decks now, Summon: Valigarmanda is a card many players will wish was Standard legal
Card Text: When Celes enters, discard any number of cards, then draw that many cards plus one