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If Valgavoth somehow enters the battlefield during an opponent's turn and that opponent had lost life earlier in the turn, its last ability won't trigger if that opponent loses life later in the turn
Best for Gameplay: Format-warping spells like Force of Will (Legacy) and Ancestral Recall (Vintage) are considered "best" because they force opponents to build decks specifically to answer them
Herald of Slaanesh is a haste enabler and a cost reducer for demons
One of the biggest threats of Underworld Breach or Yawgmoths Will is that your opponent needs to be constantly on the lookout for the possibility of you using this card to suddenly going off with some combo, or reusing as many cards from your graveyard as possible to get back into the game, or to win the game
Once you get these down, closing the game is as simple as ramping into Eldrazi