Decomposition

Black creatures get +2/+0 until end of turn.

T: Target creature with power 2 or less can't be blocked this turn.

Flying U: This creature gets +1/+0 until end of turn. Activate only once each turn.

At the beginning of your upkeep, this enchantment deals 1 damage to you. Whenever a creature is put into an opponent's graveyard from the battlefield, you gain life equal to its toughness.

At the beginning of your upkeep, this creature deals 1 damage to you.

1G, T: Create a 0/1 green Wall creature token with defender named Wood. Sacrifice a token named Wood: Add R.

The next time a source of your choice would deal damage to you and/or creatures you control this turn, prevent that damage. If damage from a black source is prevented this way, you gain that much life.

Whenever this creature deals damage to a player, that player gets a poison counter. The player gets another poison counter at the beginning of their next upkeep unless they pay 2 before that step. (A player with ten or more poison counters loses the game.)