mtg what counts as a card type exactly does it mean here by types? Lands/sorcery/instant/creature? Card Types, Subtypes, & Supertypes

With Sam, it provides an explosive mana advantage for our high-CMC finishers

Card Type: The classification of each card, such as creature, spell, or land

Now, with the release of Lorwyn Eclipsed, Valley Floodcaller decks are starting to experience a resurgence in a new form thanks to a Lorwyn Eclipsed mana rock

Activate only if two or more creatures entered the battlefield under your control this turn

White also has access to Balance type effects, so hypothetically it could make a card that causes some form of universal discard

Battle at the HelvaultBattle at the Helvault is something of a new take on Grasp of FateGrasp of Fate