Luckily, despite their high costs in near-mint (NM) condition, you can find much better deals if you look at lightly played (LP), moderately played (MP) or heavily played (HP) copies of these Dragonite cards
He comes with some built-in removal, which is always a big plus
Blightsower Thallid Color Indicator: Black and Green Creature Phyrexian Fungus When this creature transforms into Blightsower Thallid or dies, create a 1/1 green Phyrexian Saproling creature token
They also only count cards in the graveyard
Pumping your Merfolk creatures a bit and granting them a very powerful form of evasion with islandwalk means you are free to keep attacking so long as your opponent controls an island
If you cast a spell with its escape permission, you can't choose to apply any other alternative costs or to cast it without paying its mana cost