Starting with 6 cards you summon "Blast Magician", then use "Terraforming" to search for "Magical Citadel of Endymion". Play the "Magical Citadel of Endymion" and 3 permanent/equip spells. Now the "Citadel" has 3 Counters that you can use for the effect of the "Magician" to destroy 1 monster with ATK<=2100 . Next use "Giant Trunade" to give all spells back to your hand and activate them again. This way "Blast Magician" gains a total of 10 Spellcounters. Since the "Magical Citadel of Endymion" was reset when removed from the field by "Giant Trunade" you can use its Counters again for the effect of the magician to destroy 1 more monster with ATK<=2100. Of course with the 10 Counters on the magician itself you can destroy more monsters up to a total of 10x7=7000 ATK.