So long as you have a land that produces more than one mana at a time, you can instantly generate infinite mana, though you then need something to put it into, like a Fireball for instance
GSE Gold Secret Limited Limited Number C40: Gimmick Puppet of Dark Strings X DARK Rank 9 [ MachineXyzEffect ] ATK 3300 DEF 2000 3 Level 9 monsters If this card is Special Summoned: Destroy as many monsters with String Counters as possible, and if you do, draw 1 card, then inflict damage to your opponent equal to the highest original ATK among those destroyed monsters in the GY (your choice, if tied)
Its really good at making you draw, but also good at making your opponent draw
You can play Angel tribal, or Soldier tribal, or you can go the Voltron route
But of course, there are cards with some high-cost attacks that deal a significant amount of damage