You do have emotes where you can congratulate an opponent on a win and other such one liners, but generally even though the game is called MTG: Arena and it is an online game with real life opponents, as you play you barely even make that connection
Blues combat tricks focus on making creatures bigger, like Serpentine Ambush and Wings of Velis Vel
A few of our creatures and a few of our abilities require creatures to attack, and I like if I can get those triggers without losing my creature
For example, those who desire to dish out a ton of damage with no regard to anything else may like building a Fire-type deck, while the more patient and strategically inclined trainers might prefer a Grass-type one
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However, if you do, and that creature card is an illegal target at the time Mourner's Surprise tries to resolve, it won't resolve and none of its effects will happen