This is the sweet spot in Commander to me: the power-to-dollar ratio is at its highest around this price point, and can be easily tweaked to increase or decrease in power as you see fit
The complete 27-card checklist and the six-figure hall of fame follow the countdown

Beast Whisperer Whenever you cast a creature spell, draw a card Elder Gargaroth Vigilance, reach, trample Whenever Elder Gargaroth attacks or blocks, choose one Create a 3/3 green Beast creature token You gain 3 life Draw a card Ohran Frostfang Attacking creatures you control have deathtouch Whenever a creature you control deals combat damage to a player, draw a card Regal Force When Regal Force enters the battlefield, draw a card for each green creature you control Runic Armasaur Whenever an opponent activates an ability of a creature or land that isnt a mana ability, you may draw a card Toski, Bearer of Secrets This spell cant be countered Indestructible Toski, Bearer of Secrets attacks each combat if able Whenever a creature you control deals combat damage to a player, draw a card Non-Budget Enchantment Decks If you are playing an enchantment-focused deck, these are nearly mandatory inclusions to ensure you green card draw strategy

Illustrated by Yeong-Hao Han Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Not Legal Modern Legal Brawl Not Legal Legacy Legal Comp
You can also trigger powerful effects by guessing the cost of the top card of your opponents deck