Myrs and Golems
One of the founding fathers of Magic writing and theory was Eric Taylor, who defined it like this: "Card advantage is any process by which a player obtains effectively more cards than his opponent." If that definition seems a bit nebulous, it's because card advantage can take such a tremendous variety of forms
The perfect introduction to Magics most popular formatjoin your friends in epic multiplayer battles with a ready-to-play MTG deck
Quick Draw also has a lot of solid reprints, especially cards like Veyran, Voice of Duality, Bloodthirsty Adversary, Rousing Refrain, Pongify, Winged Boots, and Shark Typhoon
If they dont have a powerful attack in the Active Spot, using Bosss Orders can be a powerful strategy
Its not a huge theme, but Rydia, Summoner of Mist, Garnet, Princess of Alexandria, and Yuna, Hope of Spira are all great payoffs for playing summons