Obelisk of Alara

{1}{W}, {T}: You gain 5 life. {1}{U}, {T}: Draw a card, then discard a card. {1}{B}, {T}: Target creature gets -2/-2 until end of turn. {1}{R}, {T}: This artifact deals 3 damage to target player or planeswalker. {1}{G}, {T}: Target creature gets +4/+4 until end of turn.