Collection of MC 1.13 Commands (in dev)

--Villager with a diamond to emerald trade (template for own trades)
/summon minecraft:villager ~ ~ ~ {Offers:{Recipes:[{buy:{id:"minecraft:diamond",Count:1b},sell:{id:"minecraft:emerald",Count:1b}}]}}
--Chair (invisible saddled pig)
/summon pig ~ ~ ~ {ActiveEffects:[{Id:14b,Amplifier:0b,ShowParticles:0b,Ambient:0b,Duration:9000000}],NoAI:1b,Saddle:1b}
--A little minigame; run this in a repeat command block and try to catch the apple to stop the leave 'worm'
/execute at @e[type=item,nbt={Item:{id:"minecraft:apple"}}] run setblock ~ ~ ~ oak_leaves