In accepting that mana advantageand by extension, time advantage (or vice-versa)is real and matters, you can clearly see how devastating these exchanges can be
It has no mana cost, and thus its mana value is 0
In the case of Sazh's Chocobo, when a land hits the battlefield, it gets a +1/+1 counter , meaning that the more lands you can play each turn, the more counters it gets, and despite starting as a 0/1 creature, it can become quite the hulking beast very quickly
Instead, the flesh of its dead gives rise to alga
Theres only two here, and you could cut this and the Bad Combos for more interaction spells and to save face if someone at your table will lay into you for thinking you could cast a 5-drop