Sure, you need to attack first to unlock the ability, so its not quite as immediate
Their abilities also seem to work better with decks that include green since they're primarily focused on creature support, lifegain, and enchantment support
This common creature is very playable in a lot of formats including Pauper, Pioneer, and Modern
Vincent Valentine // Galian Beast Rarity: Rare TYPE: Legendary Creature // Legendary Creature SUBTYPE: Assassin // Werewolf Beast CMC: 4 Mana cost: USD: $6.96 EUR: 5.57 TIX: 0.10 EDHREC RANK: 3653 (2/2) Whenever a creature an opponent controls dies, put a number of +1/+1 counters on Vincent Valentine equal to that creature's power
Whenever a creature dies, if it had power greater than Drizzt's power, put a number of +1/+1 counters on Drizzt equal to the difference
If youre looking for additional options for mana ramp in Simic colors beyond the really busted stuff, here are a few additional cards I can recommend: Coiling Oracle: The original Growth Spiral design, this card looks specifically at the card you draw before dictating what you can do with it