INFINITE MINECART
REPEATING COMMAND
/execute @e[type=minecart] ~ ~ ~ fill ~ ~ ~ ~ ~ ~ golden_rail 0 replace air
LEADING INTO CHAIN COMMAND
/execute @e[type=minecart] ~ ~ ~ fill ~ ~ ~-1 ~ ~ ~1 redstone_torch 0 replace air

NO GRAVITY
/entitydata @e[type=!Player] {NoGravity:1b}
TURN ON GRAVITY
/entitydata @e[type=!Player] {NoGravity:0b}

AUTO SADDLE
/entitydata @e {Saddle:1b}

ENTITIES CREATE BLOCKS
/execute @e[type=!Player] ~ ~ ~ setblock ~ ~ ~ log

INVISIBLE MOBS
/execute @a ~ ~ ~ effect @e[type=!Player,r=10] minecraft:invisibility 1 1 true

XP IS EXPLOSIVE
/execute @e[type=xp_orb] ~ ~ ~ summon tnt ~ ~ ~ {Fuse:1}

TELEPORTATION BOW
/tp @e[type=!Player] @e[type=arrow,score_counter_min=1,c=1]

TNT ARROWS
/execute @e[type=arrow,score_counter_min=1,score_counter=1] ~ ~ ~ summon tnt ~ ~ ~ {Fuse:1}