You can sacrifice whatever creature you want unless theres a card that says that you cant sacrifice permanents (Angel of Jubilation comes to mind)
Another card preview confirms that Phyrexia, one of the oldest antagonists in the game, have returned (or resurfaced) in a way we havent seen in quite some time
Is it worth it to collect CE/IE cards
Kabira Outrider Another common rarity party card
C Common Fury of Fire X SPELL (This card is always treated as a "Salamangreat" card.) Special Summon up to 2 "Salamangreat" monsters with different names from your hand and/or GY in Defense Position, but their effects are negated, also, for the rest of this turn after this card resolves, you can only Special Summon from the Extra Deck once

A bold claim, I know, but lets take a moment to compare Deep Gnome Terramancer to most of whites other mana ramp spells: You dont need to be behind your opponents in land count to trigger this ability There arent any extra mana costs you have to pay for this mana ramp effect (and unlike treasure generators, this ramp is also more permanent) Deep Gnome Terramancer only costs 2 mana, putting it on par with the rate found on many of greens best ramp spells Like Natures Lore and Three Visits, you can fetch nonbasic Plains cards like Jetmirs Garden The condition for this cards effect happens all the time in Commander, and can be found on cards in most decks of any power level your opponents are playing even precons