Im putting it on this list because the previous printing was over 20 years old, and selling for over $80

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

Much better in the slower builds than the aggressive ones obviously
That is the joy that is magic, there is always a solution to a problem, you just have to recognize when there is a problem and respond accordingly
It ensures your deck is well-rounded and functional, containing not just the fun, thematic cards that execute your strategy, but also the essential ramp, draw, and interaction needed to survive a multiplayer game
Zombies focused on creating a massive horde of creatures and Vampires drained opponents through aggro and lifegain