Earthbending Lesson, which turns a target land you control into a 0/0 land creature with haste, then puts four +1/+1 counters on that creature-land
Modern is quickly becoming a pricey format to buy into if you dont already have access to the staples

Legendary 107 Felicia, Always Hungry Common 108 Fidget, Ratigans Henchman Common 109 Honest John, Not That Honest Rare 110 Lady Tremaine, Imperious Queen Super Rare 111 Lady Tremaine, Overbearing Matriarch Common 112 Lumiere, Hotheaded Candelabra Rare 113 Minnie Mouse, Stylish Surfer Uncommon 114 Minnie Mouse, Wide-Eyed Diver Rare 115 Minnie Mouse, Zipping Around Common 116 Mother Gothel, Withered and Wicked Uncommon 117 Mulan, Soldier in Training Common 118 Namaari, Nemesis Super Rare 119 Queen of Hearts, Impulsive Ruler Uncommon 120 Queen of Hearts, Sensing Weakness Uncommon 121 Ratigan, Very Large Mouse Rare 122 Raya, Headstrong Common 123 Raya, Leader of Heart Super Rare 124 Raya, Warrior of Kumandra Uncommon 125 Scar, Vicious Cheater Legendary 126 Shere Khan, Menacing Predator Rare 127 Tigger, One of a Kind Common 128 Tuk Tuk, Wrecking Ball Rare 129 Go the Distance Common 130 Teeth and Ambitions Rare 131 The Most Diabolical Scheme Uncommon 132 What Did You Call Me

For this list, Ive included cards with a strict Jeskai color identity, meaning that some dual-color or mono-color staples of popular decks, like Lightning Bolt, Lightning Helix, or Treasure Cruise, are excluded