Grave Upheaval is a nice little reanimation card. While most cards like this usually cost 5 mana, it's costed higher due to having this cycling ability. In Commander, paying 6 mana for this effect is OK, especially since the creature you get can be from any graveyard and it gains haste. It's a card I could see myself playing.
Sylvan Reclamation is a slightly over-costed Return to Dust. But having the flexibility in the early game to cycle it for a land you need makes it worth the trade-off of paying an extra mana later. It's also nice that it always removes two cards, because Return to Dust only hits one card unless you play it during your own main phase. It's definitely a card that can see a strong amount of play in a variety of Commander decks.
Overall, I like Grave Upheaval more than Sylvan Reclamation, but both are playable cards.