Whenever Mirko Vosk deals combat damage to a player, they have to reveal cards from the top of their library until theyve revealed four Land cards
If it was a circle then the card was common
Cards with unique abilities are always hard to judge at first glance, so there's sure to be some other interesting ways that Senu surprises all of us.
You return a creature card from your graveyard to your hand, draw three cards, then gain 5 life
In general, I would look at these two factors when looking to include cards not of your tribe's creature type: Is this creature so strong that it, on its own, is generally stronger than my tribal creatures when they are receiving bonuses and/or empowering my other cards
This gives you 100-110 total cards per box, compared to 150 cards in a standard 30-pack booster box