One opponent will lose in their next draw
But leaving open instead of is a different proposition and giving an opponent a free Time Walk to make it Teferi's Protection basically renders the card unplayable
Well, some things that may draw you into specific colors are: A really strong rare you're excited about playing Having plenty of "removal"cards that can destroy, exile, or keep an opponent's card tapped Opening many cards in that color A good "mana curve" in that colorcreatures of different mana values, more on the 2, 3, or 4 end than on the 5 or greater end Several multicolor cards in those colorscards that have multiple colors are often more powerful than those with just one color Ideally, the colors you pick will have all four of those features, but if only two or three of those are true, that's plenty good
We try to consolidate in any one block to only put one type of counter on creatures
A big finisher that is hard to remove and is relevant as soon as it hits the table
A rogue dons a magic cloak, and slips unseen past the guards