As to how you get all these card types in your graveyard, there's the traditional route: have some creatures die in combat, cast a few spells, maybe a planeswalker will decide she's had enough of your shenanigans and sit in your graveyard for a while because her loyalty...look, not every metaphor works, okay
Sword of Forge and Frontier allows you to exile the top two cards of your library and play them in that turn, and also allows you to play an additional land on that turn too
Banlist History Restriction changes recorded for Small World
Machina Defender X EARTH Level 4 [ Machine / FlipEffect ] ATK 1200 DEF 1800 FLIP: Add 1 "Commander Covington" from your Deck to your hand
Kaervek the Merciless Kaervek the Merciless has a pretty steep mana value but it more than makes up for it by thoroughly punishing your opponents for each spell they play
Chimney Imp is bad enough to make this list (a 1/2 flyer for five mana is really below rate), but it gives you card advantage (usually) when it dies