HYDRA from Marvel Super Heroes
Building this commander is a nice exercise because youll want to mill opponents, cast low-mana value spells to be able to double spell a lot, along with casting some high-cost spells
Until end of turn, Ms
Here are all of the budget instant speed green card draw spells you can include in your decks: Charge Through Target creature gains trample until end of turn Draw a card Hunters Insight Choose target creature you control Whenever that creature deals combat damage to a player or planeswalker this turn, draw that many cards Inspiring Call Draw a card for each creature you control with a +1/+1 counter on it Those creatures gain indestructible until end of turn Viridescent Wisps Target creature becomes green and gets +1/+0 until end of turn Draw a card Warriors Lesson Until end of turn, up to two target creatures you control each gain Whenever this creature deals combat damage to a player, draw a card Here is a pre-populated list of all of those 2 mana instant speed green card draw spells I was mentioning

Balefire Dragon Bitterblossom Cavern of Souls Dark Depths Emrakul, the Aeons Torn Karakas Karn Liberated Kozilek, Butcher of Truth Leovold, Emissary of Trest Liliana of the Veil Lord of Extinction Mana Vault Mikaeus, the Unhallowed Platinum Emperion Sigarda, Host of Herons Snapcaster Mage Tarmogoyf Temporal Manipulation Ulamog, the Infinite Gyre Vengevine
This is easy to set up, especially when paired with the Misty Supporter card, which provides Water Energy