For various amounts of mana, you can give a creature vigilance, deathtouch, or doublestrike for the turn, turning any creature into a deadly powerhouse
Shocklands Of course, some of the most memorable cards in Ravnica are the so-called Shocklands, the dual lands that enter the battlefield tapped unless you lose 2 life, in which case they enter untapped
You'll be slinging spells, sure, but Rootha creates flying Elementals with Haste and power/toughness equal to the highest mana value spell you cast in your first main phase
Stormtide Leviathan 6.5 One of the best lockdown creatures on offer
Its Crimson Storm can burn through almost any opposing Pokmon
If you want to pull a card out of your binder or ask a friend to borrow their bomb high-rarity card for a couple minutes, playing a wish effect would let you use those cards