While in theory this can cause you to lose the game (as you saw in my match against Merfolk), the truth is it can almost always be played around, unless you run into the very rare situation where you have only the second Part the Waterveil left in hand and nothing to buy another turn, whether real or virtual
Heres the best
Then theres Take Up the Shield, giving a creature a +1/+1 counter, lifelink, and indestructible for a turn, saving your creature from certain doom
Kotose, the Silent Spider While an okay Commander for exiling a problem card from someones graveyard and casting it as long as it's in exile, Kotose, the Silent Spider isnt as effective in this singleton format as it is in other formats
The first group of cards are those that allow your lands to enter untapped
Being able to take an extra turn for merely two mana is so wildly overpowered that, along with Chaos Orb and a few others, Time Walk became one of Magic's earliest banned cards