Use bombs, poisonous plants and random objects that fall from the sky to attack your rival birds, you can also use lightning, UFOs, Sea Creatures, and even Ghosts, the faster you draw your attacks, the better they are, like more poisonous plants, goo bombs, bombs that explode multiple times, and stronger items, luckily, you can draw lines to defend yourself, using them to either block things or as lightning rods, or as sticks so the plants coil around it and die