For utility lands, I highly recommend Otawara, Soaring City + Takenuma, Abandoned Mire for always useful utility, Shizo, Death's Storehouse to give Venser evasion, and Phyrexian Tower which can turn The Hollow into ramp
An Isochron Scepter package that may include Orim's Chant, removal, tutors, counterspells, etc
But if you find yourself in a hand-based matchup, like a combo deck or a blue mirror, then Ego Drain seems like a big add for your Halo Forager package basically Faerie Fencing for non-creature decks
A 4/4 for four mana, Raggadragga not only provides creatures with mana abilities with +2/+2, but it states that whenever such a creature attacks, it untaps, meaning they may be used to attack and produce mana within the very same turn
But it might be time for that to change in Historic thanks to the printing of Longtusk Stalker in Jumpstart: Historic Horizons , which solves one of the deck's biggest issues: the lack of a playable one-drop creature
Alternatively, if you like a more chaotic game, you can use this card to have players drop their best creatures early on and see what happens
