Since the cards are put into the graveyard first before leaving with Teval's effect, when you return a land to the battlefield, you will also trigger Teval's second effect to create a 2/2 Zombie
Ascendant Acolyte, which can pretty much give you the Simic Ascendancy win all by itself
Chaos Warp, designed especially with Commander in mind, can quickly shuffle any permanent back into its owner's deck, then take a gamble on whether the player's next card is a permanent or not
Thats right: you have a better chance of opening a $10+ rare in MM15 than in MM17
Creature - Dragon Enduring Courage Whenever another creature you control enters, it gets +2/+0 and gains haste until end of turn
They come back as a new card and the two original cards both no longer exist from the game's perspective