Hi I´m Trenloco , my favorite splinter choice might seem odd. I love the Life splinter , which everyone seems to hate lol.
I find you can build a viable silver-gold deck on the cheap, using the dragon summoner that buffs ranged and snipe monsters.
Very powerful, with a couple debuffs thrown in (crystal werewolf, warrior of peace, ooze).
Most important of all , its not nearly as known as say , Earth / Fire so rentals are cheap.