this is my first ccg tiup, so bear with me. First of all, these comboes are just thoughts, so don't get POed if you think i'm a noob or something, and these comboes are stupid. Just a fun combo to base a deck around.
 
1) Heard of Dark Tyranno?  Well, he is  a 2 trib dino who attks directly if all ur opponents monsters are in def mode. So, play a card like Ultra Evolution Pill(Sac a reptile on field to summon dino in hand), or just summon it regularly, watever, duznt matter.
then play Stagger face down; this trap card  when face up switches all normal, flip and special summoned cards to defense mode automatically.
Still dont kno wat i am getting to? Well, play gravity axe on ur huge Dino. He will gain 500 attk,(stronger than BEWD and CED), and ur opponent cant switch the mode of their monsters.
Now, ur opponent only can summon mons in def, allowing tyranno to attk directly, twin swords also are a cool addition to do 6200 in one turn(attk 2 x in 1 turn)
2) Now this is very fun, but i'm nbot sure if it is legal. First you play ultimate offering. This allows you to normal summon again for 500 lp. Then play Begone Knave: this sends back any card that did battle damage from field to hand. Nor play a Servant of Catobalism(700 direct attacker). I'm, not sure if it is legal, but i think that servant can attk for 700, sent back to hand, pay 500, get back on field, etc. I dont really know if this is legal, so feel free to email me at nachoskillz@hotmail.com about the combo. also, please have reason to critisize me, thx for reading