River Boa

Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.) This creature can't block.

Cumulative upkeep 1 (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.) At the beginning of your upkeep, put a rust counter on each artifact target opponent controls. Then destroy each artifact with mana value less than or equal to the number of rust counters on it. Artifacts destroyed this way can't be regenerated. When this enchantment leaves the battlefield, remove all rust counters from all permanents.

Destroy target artifact, enchantment, or land.

Target creature gets +1/+1 until end of turn. Draw a card at the beginning of the next turn's upkeep.

Cumulative upkeep 1 (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.) When you play a card, sacrifice this artifact. 2: You gain 1 life.

Choose one — • Destroy target artifact creature. • Attacking creatures get +1/+0 until end of turn. • Target creature with power 2 or less can't be blocked this turn.

First strike When this creature enters, destroy target nonartifact, nonblack creature. That creature can't be regenerated.

Look at the top four cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order.