Shapeshifter Blob

On your main phase, count your opponent's mana.
If your opponent has mostly swamps, this gains deathtouch for 2 turns.
If your opponent has mostly mountains, this gains trample for 2 turns.
If your opponent has mostly islands, this gains flying for 2 turns.
If your opponent has mostly forests, this gains hexproof for 2 turns.
If your opponent has mostly plains, this gains first strike for 2 turns.